| Date |
Highlight |
Links to more Information
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3 November 2011
 |
Headline news:
In a collaboration between the Elsaesser/Nibbering (MBI)
and Levinger (Colorado State University, USA) teams the vibrational
energy migration pathways in phospholipid reverse micelles
are investigated with ultrafast mid-IR pump-probe spectroscopy.
|
Link to original
paper
|
| |
One sentence summary:
The key role of hydration for mediating ultrafast energy migration
and dissipation in phospholipids self-assembled into reverse
micelles is exemplified by determination of the rate of resonant
excitation transfer between phosphate groups and by introducing
a water pool as a confined heat sink for excess energy. |
More details
on page of subproject 1 |
| |
|
Contact: Thomas Elsaesser
Contact: Erik T. J.
Nibbering
Contact: Nancy
E. Levinger
|
| |
Nancy and René discussing the results on the phospholipid
reverse micelles
|
|
| |
External funding by:
National Science Foundation (Grant CHE 0628260)
European Research Council Advanced Grant under the European
Union´s Seventh Framework Programme (FP7/2007-2013)/ERC
grant agreement no. 247051
|
Link to ERC |
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29 September 2011
|
Headline news:
In a collaboration between the Nibbering (MBI) and Batista
(Yale University, USA) teams the solvent-induced OH stretching
frequency shifts of a prototypical photoacid dissolved in
nonpolar/weakly polar solvents are explained in a combined
transient IR spectroscopic and quantum chemical calculational
study. |
Link to original paper
|
| |
One sentence summary:
The vibrational frequency shifts of the OH-stretching mode
of uncomplexed 2-naphthol observed with femtosecond IR spectrosocpy
in the electronic ground and excited states are explained
using a perturbative solute-solvent interaction model and
parametrized by (TD-)DFT quantum chemcial calculations. |
More details
on page of subproject 2 |
| |
|
Contact: Erik T. J.
Nibbering
Contact: Victor S.
Batista |
| |
Skype conference with the Yale group.
|
|
| |
External funding by:
National Science Foundation (Grant CHE 0911520)
Fonds Québecois de la Recherche sur la Nature et les
Technologies
|
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12 May 2011
|
Headline news:
In a joint collaboration between the Elsaesser/Nibbering
(MBI) and Temps (Christian Albrechts Universität zu Kiel)
teams the N-H stretching spectroscopy of Guanosine-Cytidine
base pairs is unraveled. |
Link to original
paper (Published in the Shaul
Mukamel Festschrift)
|
| |
One sentence summary:
Linear FT-IR and 2D-IR photon echo spectroscopy provide insight
into the dynamics and couplings of the N-H stretching manifold
of GC base pairs in solution. |
More details
on page of subproject 1 |
| |
|
Contact: Erik T. J.
Nibbering
Contact: Thomas Elsaesser
Contact: Friedrich
Temps
|
| |
External funding by:
European Research Council Advanced Grant |
Link to ERC |
|
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5 May 2011
|
Headline news:
In a joint collaboration between the MBI and the Freie
Universität Berlin the complexation chemistry of 2-chloro-4-nitrophenol
with acetate in dichloromethane has been surveyed in a combined
UV/NMR heterospectral correlation approach with unsurpassed
detail. |
Link to original
paper
|
| |
One sentence summary:
Two-dimensional heterospectral UV/NMR correlation spectroscopy
provides insight into the composition of hydrogen-bonded complexes
in dichloromethane solution. |
More details
on page of subproject 1 |
| |
|
Contact: Peter M.
Tolstoy
Contact: Erik
T. J. Nibbering
Contact: Thomas Elsaesser
|
| |
External funding by:
European Research Council Advanced Grant |
Link to ERC |
|
|
|
10 February 2011
|
Headline news:
2D-IR photon echo spectroscopy on DNA oligomers monitor
individual line broadening and vibrational energy transfer
of the NH-stretching modes of the DNA bases. |
Link to original
paper
|
| |
One sentence summary:
Ultrafast 2D-IR spectroscopy of the NH-stretching bands of
adenine–thymine base pairs in DNA oligomers enable to
distinguish different line broadening as well as energy transfer.. |
More details
on page of subproject 1 |
| |
|
Contact: Thomas Elsaesser
|
| |
External funding by:
European Research Council Advanced Grant |
Link to ERC |
|
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1 July 2010
|
Headline news:
In a collaboration between the MBI, the Free University
Berlin and the University of Wroclaw, different spectroscopic
techniques are used to determine hydrogen bond complexation
and tautomerization of 2-pyridone, a classic spectroscopic
problem, in dichloromethane solution. |
Link to original paper I and Link
to original paper II
|
| |
One sentence summary:
Hydrogen bond complex formation of 2-pyridone in dichloromethane
solution is unraveled in a combined approach exploiting NMR,
steady-state FT-IR (including 2D correlation spectroscopy),
femtosecond IR pump-probe wavepacket spectroscopy, and quantum
chemical calculations. |
More details
on page of subproject 1 |
| |
|
Contact: Erik T. J.
Nibbering
Contact: Thomas Elsaesser
|
| |
External funding by:
German Science Foundation: SFB450-B2 (Sonderforschungsbereich
450 "Analyse und Steuerung ultraschneller photoinduzierter
Reaktionen") |
Link to SFB450
web-page |
|
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5 May 2010
|
Headline news:
Recent studies provide a detailed understanding of DNA
vibrations and their dynamics, and give insight into nonequilibrium
properties and structures of hydrated DNA. |
Link to
original paper in english
Link to
original paper in german |
| |
One sentence summary:
Ultrafast IR spectroscopy of the NH and PO stretching bands
of adenine–thymine base pairs in DNA oligomers enable
to separate and assign DNA and water vibrations, to determine
their couplings, and to unravel microscopic processes governing
the dynamics of hydration shells. |
More details
on page of subproject 1 |
| |
|
Contact: Erik T. J.
Nibbering
Contact: Thomas Elsaesser
|
| |
External funding by:
German Science Foundation: SFB450-B2 (Sonderforschungsbereich
450 "Analyse und Steuerung ultraschneller photoinduzierter
Reaktionen") |
Link to SFB450
web-page |
|
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12 November 2009
|
Headline news:
Carbonic acid, the hydrated form of carbon dioxide, so
ubiquitous on Earth but yet to be observed in aqueous solution,
can be accessed with transient infrared spectroscopy. |
Link to
original paper |
| |
One sentence summary:
The intrinsic formation dynamics of carbonic acid from ultrafast
protonation of bicarbonate in aqueous solution is measured
with femtosecond infrared spectroscopy, resulting in the determination
of the real acidity constant, that will be of much use in
research areas ranging from biophysiology, biogeochemistry,
ocean ecology and carbon dioxide sequestration. |
Pressemitteilung
Bildung
von Kohlensäure in Echtzeit verfolgt
 Press
Release
Real
time generation and observation of carbonic acid
|
| |
Ultrafast protonation of bicarbonate using UV-photoexcited
naphthol photoacid generates carbonic acid, H2CO3,
in aqueous solution as followed by infrared-active marker
modes
|
Communiqué
de Presse
Formation
et observation de l’acide carbonique en temps réel
Persbericht
Koolzuur
molecule in water gedetecteerd
|
| |
Photos
Ehud Pines, Dina Pines, Mirabelle Prémont-Schwarz,
Katrin Admaczyk and Erik T. J. Nibbering having a break after
discussing the carbonic acid results in march 2009.
|
More
details on page of subproject 2
Carbonic acid captured
Article
by Simon Hadlington
Fünf Minuten Chemie
Kohlensäure gibt es praktisch nicht
Article
by Wolfgang W. Merkel
|
| |
External funding by:
German-Israeli Foundation for Scientific Research and Development:
GIF I-876-107.5. |
Contact: Erik T. J.
Nibbering
Contact: Ehud Pines
|
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29 April 2009
|
Headline news:
Subpicosecond infrared-pump/anti-Stokes Raman-probe spectroscopy
provides key insight into the question how vibrational energy
flows in DNA. |
Link to original paper |
| |
One sentence summary:
Spectrally selective excitation within the NH stretching band
of adenine–thymine base pairs in DNA oligomers is observed
to lead to distinct vibrational energy flow pathways in the
NH bending fingerprint modes. |
More details
on page of subproject 3 |
| |
|
Contact: Wolfgang Werncke
Contact: Erik T. J.
Nibbering
Contact: Thomas Elsaesser
|
| |
External funding by:
German Science Foundation: DFG WE 1489/6 |
|
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11 November 2008
|
Headline news:
Polarization-sensitive ultrafast infrared measurements
on photoinduced electron transfer in donor-acceptor pairs
provide direct access to structure and dynamics of distinctly
different tight and loose ion pairs. |
Link to original paper |
| |
One sentence summary:
Highly anisotropic signals from tight donor-acceptor ion pairs
generated by photoinduced bimolecular electron transfer reveal
the importance of mutual orientation of the reactants and
thus the need to refine theoretical models based on spherical
species that solely involve reaction distances. |
More details
on page of subproject 2 |
| |
Dr. Omar F. Mohammed, Dr. Erik T. J. Nibbering, Prof. Dr.
E. Vauthey and Katrin Adamczyk having a break between measurements
(February 2007).
Natalie Banerji, Dr. Omar F. Mohammed and Dr. Bernhard Lang
discussing sample preparations (November 2006).
|
Contact: Erik T. J.
Nibbering
Contact: Eric Vauthey
|
| |
External funding by:
Fonds National Suisse: Project 200020-115942 (Eric Vauthey)
LIMANS Cluster of Large Scale Facilities: MBI001176.
European Science Foundation: DYNA travel grant 1267 (O.F.
Mohammed)
|
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15 August 2008
|
Headline news:
N-H and O-H stretching vibrations of adenine-thymine double
helix oligomers resolved with ultrafast infrared spectroscopy. |
Link to original paper |
| |
One sentence summary:
Polarization-sensitive ultrafast infrared pump-probe spectroscopy
of DNA oligomer films at well-defined relative humidity provides
insight into the vibrational couplings of N-H and O-H stretching
excitations of adenine-thymine base pairs and water, respectively.
|
More details
on page of subproject 1 |
| |
Jason filling the IR-detector with liquid nitrogen (May 2006).
Lukasz aligning the parametric set-up (September 2007).
|
Contact: Erik T. J.
Nibbering
Contact: Thomas Elsaesser
|
| |
External funding by:
German Science Foundation: SFB450-B2 (Sonderforschungsbereich
450 "Analyse und Steuerung ultraschneller photoinduzierter
Reaktionen")
Natural Sciences and Engineering Research Council of Canada
|
Link to SFB450
web-page
|
|
|
|
30 July 2008
|
Headline news:
In a joint collaboration between the research teams of
Hunt at University of Strathclyde, Pickett at University of
East Anglia and of Nibbering at the MBI investigate with ultrafast
infrared spectroscopy a model system for active site of [Fe-Fe]-hydrogenase. |
Link to original paper |
| |
One sentence summary:
Structural changes upon UV irradiation of (µ-S(CH2)3S)Fe2(CO)6
in an alkane solution leads to the formation of two isomers
of the 16-electron complex (µ-S(CH2)3S)Fe2(CO)5
within 50 ps with evidence of a weakly associated solvent
adduct complex. |
More details
on page of subproject 4 |
| |
Neil T. Hunt, A. Ian Stewart, Katrin Adamczyk and Hirendra
N. Ghosh have a closer look at the experimental data (October
2007).
Katrin Adamczyk, Erik T. J. Nibbering, Neil T. Hunt, Hirendra
N. Ghosh, Anna R. Ridley and A. Ian Stewart after in-depth
discussions (October 2007).
|
Contact: Erik T. J.
Nibbering
Contact: Neil Hunt
Contact: Christopher
J. Pickett
Link
to the Neil Hunt group home page at University of Strathclyde
Link
to Christopher J. Pickett group home page at University of
East Anglia
|
| |
External funding by:
Engineering and Physical Sciences Research Council.
LIMANS Cluster of Large Scale Facilities: MBI001346.
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5 June 2008
|
Headline news:
In a joint collaboration between the research teams of
Wernet/Eberhardt at Bessy and of Nibbering/Elsaesser at the
MBI the first time-resolved x-ray absorption study of liquid
water is reported. |
Link to original paper |
| |
One sentence summary:
Structural changes in the hydrogen-bond network as induced
by resonant femtosecond-infrared excitation are monitored
via transient x-ray absorption at the oxygen K-edge. |
More details
on page of subproject 1 |
| |
|
Contact: Erik T. J.
Nibbering
Contact: Thomas Elsaesser
Contact: Philippe Wernet
Link
to the Philippe Wernet group home page at Bessy
|
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23 March 2008
|
Headline news:
Erik T. J. Nibbering gives his opinion on the structure
of water in an interview in a feature in Faszination Wissen
broadcasted by Bayerischer Rundfunk. |
Bayerischer
Rundfunk - Faszination Wissen |
| |
Faszination Wissen •
Bayerisches Fernsehen
Donnerstags um 21.15 Uhr • 23.3.2008
Faszination Wissen
Unser Wasser - tot oder lebendig? |
Contact: Erik T. J.
Nibbering
|
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|
15 January 2008
|
Headline news:
Temperature dependence of OH stretching spectral diffusion
in neat liquid water indicate delocalised vibrational excitations
subject to local hydrogen bond network dependent memory loss
of structure. |
Link to original paper |
| |
One sentence summary:
Structural memory loss of water, as evidenced in temperature-dependent
two-dimensional infrared spectra, slows down with decreasing
temperature, beyond vibrational energy transfer times suggesting
delocalization of OH stretching excitations over several water
molecules. |
More details
on page of subproject 1 |
| |
 
Alexander Paarmann with new sample design.
Nils Huse, Erik T. J. Nibbering, Michael L. Cowan, Alexander
Paarmann, Darren Kraemer and Thomas Elsaesser during discussions
(May 2006).
 
The Toronto team videoconferencing with the MBI team (spring
2007). |
Contact: Erik T. J.
Nibbering
Contact: Thomas Elsaesser
Contact: R.
J. Dwayne Miller
Link to the Dwayne
Miller group home page at the University of Toronto
|
| |
External funding by:
German Science Foundation: SFB450-B2 (Sonderforschungsbereich
450 "Analyse und Steuerung ultraschneller photoinduzierter
Reaktionen")
Alexander von Humboldt Foundation (RJD Miller)
Canadian Foundation for Innovation
Natural Sciences and Engineering Research Council of Canada
Photonics Research Ontario
|
Link to SFB450
web-page
|
|
|
|
12 February 2007
|
Headline news:
A general framework based on Eigen and Weller's classic
diffusion reaction model for aqueous acid-base neutralization
reactions explains that base-induced solvent switches mediate
the proton-transfer dynamics between pyranine and trichloroacetate.
|
Link to original paper |
| |
One sentence summary:
Upon mutual diffusion of an acid and a base to form an encounter
reaction complex in aqueous solution, ultrafast solvent switches
mediate the proton transfer between acid and base. |
More details
on page of subproject 2 |
| |
|
|
| |
Link to News &
Views commentary by James T. Hynes
|
Contact: Erik T. J.
Nibbering
Contact: Ehud Pines
|
| |
External funding by:
German-Israeli Foundation for Scientific Research and Development:
GIF 722/01.
Cultural department and study mission (Kulturabteilung und
Studienmission) of the Embassy of the Arabic Republic Egypt
(Omar F. Mohammed).
|
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8 February 2007
|
Headline news:
Inter- and intramolecular vibrations of water are used
as structural probes to show that vibrational energy transfer
from individually excited water molecules to intermolecular
modes follows a two-stage scenario of ultrafast weakening
and slower breaking of hydrogen bonds. |
Link to original paper |
| |
One sentence summary:
A two-stage structural response to vibrational energy disposal
in the hydrogen bond network of water is revealed to consist
of initial rearrangement into local intermolecular modes with
hydrogen bond weakening, followed by delocalization over extended
water networks accompanied by hydrogen bond breaking and macroscopic
heating.
|
More details
on page of subproject 1 |
| |
|
|
| |
External funding by:
German Science Foundation: SFB450-B2 (Sonderforschungsbereich
450 "Analyse und Steuerung ultraschneller photoinduzierter
Reaktionen").
 Mizuho
Foundation for the Promotion of Sciences (S. Ashihara)
Alexander von Humboldt Foundation (A. Espagne)
|
Contact: Erik T. J.
Nibbering
Contact: Thomas Elsaesser
|
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28 December 2006
|
Headline news:
In a collaboration of the Vauthey (Université de
Génève, Switzerland) and Nibbering (MBI) groups
strongly and weakly coupled ion pairs have been observed in
photoinduced bimolecular electron transfer reactions in solution.
|
Link to original paper |
| |
One sentence summary:
The asymmetric CN-stretching mode of 1,4-dicyanobenzene radical
anion provides insight into the ultrafast formation and decay
times of strongly and weakly coupled ion pairs as well as the
dissociation of geminate ion pairs on picosecond time scales. |
More details
on page of subproject 2 |
| |
The broader peak at early pulse delays is attributed to
the radical anion CN-stretching vibration within a strongly
coupled ion pair, formed by ultrafast "static" quenching
of the photoexcited perylene chromophore. A band narrowing
on a time scale of a few tens of picoseconds observed on the
antisymmetric CN stretching vibration of the dicyanobenzene
radical anion indicates that a substantial part of the excess
energy is channeled into vibrational modes of the product,
despite the fact that the reaction is weakly exergonic. An
additional narrowing of the same band on a time scale of several
hundreds of picoseconds observed in acetonitrile only is interpreted
as a signature of the dissociation of the geminate ion pairs
into free ions.
 
The research team at the MBI in summer 2005 during the first
measurment period: Dr. Bernhard Lang, Omar F. Mohammed, Nathalie
Banerji and Dr. Erik T. J. Nibbering.
|
|
| |
External funding by:
Fonds National Suisse: Project 200020-107466.
LIMANS Cluster of Large Scale Facilities: MBI001176.
Cultural department and study mission (Kulturabteilung und
Studienmission) of the Embassy of the Arabic Republic Egypt
(Omar F. Mohammed).
|
Contact: Erik T. J.
Nibbering
Contact: Eric
Vauthey |
|
|
|
4 December 2006
|
Headline
news:
Observation of coherent wavepacket modulations of the
amino hydrogen bond of the 7-azaindole dimer. |
Link to original paper |
| |
One sentence
summary:
Femtosecond N–H stretching excitation induces coherent underdamped
motions of the 7-azaindole dimer, dominated by the anharmonically
coupled 110 cm-1 stretching mode of the hydrogen bonds. |
More details
on page of subproject 1 |
| |
The low-frequency dimer stretching mode of 7-azaindole dimer
anharmonically coupled to the N-H stretching mode.
Dr. Jason R. Dwyer prepares for the two colour pump-probe
experiments.
|
Contact: Erik T. J.
Nibbering
Contact: Thomas Elsaesser
|
| |
External funding by:
German Science Foundation: SFB450-B2 (Sonderforschungsbereich
450 "Analyse und Steuerung ultraschneller photoinduzierter
Reaktionen").
Natural Sciences and Engineering Research Council of Canada.
|
Link to SFB450
web-page |
|
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|
12 October 2006
|
Headline
news:
Klaus Tschira Preis für verständliche Wissenschaft 2006
für Dr. Nils Huse. |
Pressemitteilung |
| |
One sentence
summary:
Physiker des Max Born Instituts erhält den Klaus
Tschira Preis für verständliche Wissenschaft 2006 für
seine klare Darstellung von Forschungsergebnissen: Das
kurze Gedächtnis des Wassers, wo er schildert, wie die moderne
Experimentalphysik die Anomalien von Wasser erforscht. |
Klaus Tschira
Stiftung
Studienstiftung des deutschen Volkes
|
| |
Die Preisverleihung
fand am 12. Oktober 2006 in der Alten Aula der Universität
Heidelberg statt.
|
Bild
der Wissenschaft Plus: Sonderveröffentlichung enthält
die Originalbeiträge der Preisträger, sowie Informationen
über die Studienstiftung des deutschen Volkes und die Klaus
Tschira Stiftung
Preisträger:
Informationen über den beruflichen Werdegang der Preisträger
|
|
|
|
21 August 2006
|
Headline news:
Mode-selective O–H stretching relaxation in a hydrogen
bond observed to occur via overtone and combination bands
in which the O-H bending mode plays a dominant role. |
Link to original paper |
| |
One sentence summary:
Transient IR-pump/IR-probe and IR-pump/resonance Raman probe
measurements grasp the vibrational energy flow pathway in TINUVIN. |
More details
on page of subproject 3 |
| |
Energy level scheme (harmonic scaling) for selective relaxation
of the O-H stretching band excitation into fingerprint mode
over- and combination tones.
|
|
| |
External funding by:
German Science Foundation: DFG-WE 1489/6 . |
Contact: Wolfgang Werncke
Contact: Thomas Elsaesser
|
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|
20 July 2006
|
Headline
news:
Lise-Meitner Preis für Dr. Nils Huse. |
Pressemitteilung |
| |
One sentence
summary:
Physiker des Max Born Instituts erhält Preis für seine
herrausragende Doktorarbeit auf der Festveranstaltung des Instituts
für Physik und der Vereinigung der Freunde und Förderer
des Instituts für Physik e.V. der Humboldt Universität
zu Berlin. |
Freunde und Förderer
der Physik der HU Berlin
Institut für
Physik
Humboldt-Universität zu Berlin
|
| |
Übergabe des Lise-Meitner-Preises durch den Vorsitzenden
des Vorstandes der Freunde der Physik, Prof. M. Müller-Preußker
an Dr. Nils Huse (MBI) für seine herausragende Dissertation
(Fotogalerie)
|
Scienzz
|
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|
12 June 2006
|
Headline
news:
The Elsaesser/Nibbering team report on the femtosecond
dynamics of coupled O–H stretching and bending excitations
in neat water (H2O), revealing a Fermi resonance
between the O–H stretching and bending vibrations. |
Link to original paper |
| |
One sentence
summary:
Transient vibrational spectra and their kinetics reveal a Fermi
resonance between the O–H stretching and bending vibrations
and femtosecond lifetimes of the intramolecular vibrational
excitations of liquid water. |
More details
on page of subproject 1 |
| |
The Berlin team members Satoshi Ashihara (guest scientist
from the Institute of Industrial Science, University of Tokyo,
Tokyo, Japan) and Nils Huse discussing vibrations in water..
|
|
| |
What are
O-H stretching and bending modes?
Examples given here. (click on images for animated gif-files
6 MB)
Stretching vibration of the water molecule. An ultrashort
infrared pulse excites the asymmetric stretching vibration
of the angled water molecule (red: oxygen atom, gray: hydrogen
atom). The water molecule is part of a network of hydrogen
bonds between the hydrogen and oxygen atoms on neighboring
molecules (small gray symbols). Shown are the elongations
of the atoms during the stretching vibration with a vibrational
period of 10 fs. (Animation by Jens Dreyer, MBI)
Bending motion of water. A period of the bending mode shown
lasts approximately twice as much as that of the O-H stretching
mode, i.e. 20 fs. The first overtone (v=2) level can thus
be found at a frequency close to that of the fundamental of
the O-H stretching vibration, facilitating an efficient Fermi
resonance coupling mechanism. (Animation by Jens Dreyer, MBI)
|
|
| |
External funding by:
German Science Foundation: SFB450-B2 (Sonderforschungsbereich
450 "Analyse und Steuerung ultraschneller photoinduzierter
Reaktionen").
Mizuho Foundation for the Promotion of Sciences (S. Ashihara)
Alexander von Humboldt Foundation (A. Espagne).
|
Contact: Erik T. J.
Nibbering
Contact: Thomas Elsaesser
|
|
|
|
28 December 2005
|
Headline
news:
The Nibbering (Max Born Institut for Nonlinear Optics
and Short Pulse Spectroscopy) and Cusanovich (University of
Arizona at Tucson) groups report on early time photoinduced
structural changes in photoactive yellow protein as deduced
from a combined polarization-sensitive infrared spectroscopic
and quantum chemical calculational approach. |
Link to original paper
|
| |
One sentence
summary:
After illumination of solution phase photoactive yellow protein
the primary stages of photoinduced isomerization involve a full
trans-to-cis rearrangement of the enone-moiety of the coumaric
acid chromophore. |
More details
on page of subproject 4 |
| |
 |
|
| |
The Berlin team members celebrating the paper submission (left
to right): Erik T. J. Nibbering, Omar F. Mohammed, Anwar Usman,
Jens Dreyer and Karsten Heyne.
|
|
| |
External funding by:
Cultural department and study mission (Kulturabteilung und
Studienmission) of the Embassy of the Arabic Republic Egypt
(Omar F. Mohammed).
Deutscher Akademischer Austausch Dienst (A. Usman).
 
National Institute of Health Grant No. GM66146 (Michael A.
Cusanovich).
|
Contact: Erik T. J.
Nibbering
Contact: Karsten
Heyne
Contact: Michael A.
Cusanovich |
|
|
|
7 October 2005
|
Headline
news:
The Nibbering (Max Born Institut for Nonlinear Optics
and Short Pulse Spectroscopy) and Pines (Ben Gurion University
of the Negev) groups report on the von Grotthuss-type hopping
behaviour in the exchange of a proton between an acid and
a base through a water bridge. |
Pressemitteilung
Wasserstoff-Ionen
beim Wandern erwischt |
| |
One sentence
summary:
The transient appearance of the IR-active absorption band of
the hydrated proton, with a frequency location (2570 cm-1
in H2O and 1850 cm-1 in D2O)
marking a symmetric Eigen solvation core, (H3O+)L3
(with L hydrogen accepting groups), signals a sequential, von
Grotthuss-type, proton hopping mechanism through water bridges
in aqueous acid-carboxylic base reactions. |
Press release
Hydrogen ions caught
in the act of wandering
|
| |
 |
Persbericht
Waterstofionen
tijdens het verspringen door licht geflitst |
| |
Link to original paper |
Press release
in arabic
|
| |
|
Press release
in hebrew
|
| |
The team members (left to right): Dina Pines, Ehud Pines,
Jens Dreyer, Omar F. Mohammed and Erik T. J. Nibbering
|
More details on page of subproject
2 |
| |
External funding by:
German-Israeli Foundation for Scientific Research and Development:
GIF 722/01
Cultural department and study mission (Kulturabteilung und
Studienmission) of the Embassy of the Arabic Republic Egypt
(Omar F. Mohammed)
|
Contact: Erik T. J.
Nibbering
Contact: Ehud Pines
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30 September
2005
|
Headline news:
In a collaboration between the Elsaesser/Nibbering (Max
Born Institut for Nonlinear Optics and Short Pulse Spectroscopy)
and Miller (University of Toronto) groups the intertwining
interactions of the O-H stretching vibration of acetic acid
dimer with fingerprint vibrations and low frequency hydrogen
bond modes have been disentangled with heterodyne detected
infrared photon echo spectroscopy. |
Link to original paper
|
| |
One sentence
summary:
Heterodyne-detected two-dimensional infrared photon echo correlation
spectroscopy on acetic acid dimer provides direct insight into
how the multi-level structure of the O-H stretching band is
caused by Fermi resonances with combination overtone levels
of fingerprint vibrations and by couplings with low-frequency
hydrogen bond modes. |
More details
on page of subproject 1 |
| |
 
Nils Huse and Michael L. Cowan during measurements in August
2004.
Barry D. Bruner, Nils Huse and Michael L. Cowan videoconferencing
from Toronto.
|
Contact: Erik T. J.
Nibbering
Contact: Thomas Elsaesser
Contact: R.
J. Dwayne Miller
Link to the Dwayne
Miller group home page at the University of Toronto
|
| |
External funding by:
German Science Foundation: SFB450-B2 (Sonderforschungsbereich
450 "Analyse und Steuerung ultraschneller photoinduzierter
Reaktionen")
Alexander von Humboldt Foundation (RJD Miller)
Canadian Foundation for Innovation
Natural Sciences and Engineering Research Council of Canada
Photonics Research Ontario
|
Link to SFB450
web-page
|
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17 August
2005
|
Headline news:
In a collaboration between the Nibbering (Max Born Institut
for Nonlinear Optics and Short Pulse Spectroscopy) and Tolbert
(Georgia Institute of Technology) groups the excited state
twisting rearrangement of the chromophore of green fluorscent
protein has been determined. |
Link to original paper |
| |
One sentence
summary:
Polarization-sensitive spectroscopy of the chromophore of green
fluorescent protein reveals the substantial structural rearrangement
along the twisting coordinate upon electronic excitation. |
More details
on page of subproject 4 |
| |
 |
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| |
Erik T. J. Nibbering, Omar F. Mohammed and Anwar Usman after
final business meeting in Berlin-Charlottenburg.
Kyryl M. Solntsev, Laren M. Tolbert and Erik T. J. Nibbering
after a business meeting at the ACS National Meeting in San
Diego (March 2005). Photo also shows Ehud and Dina Pines.
|
Contact: Erik T. J.
Nibbering
Contact: Laren
M. Tolbert |
| |
External funding by:
Deutscher Akademischer Austausch Dienst (A. Usman)
Cultural department and study mission (Kulturabteilung und
Studienmission) of the Embassy of the Arabic Republic Egypt
(Omar F. Mohammed)
National Science Foundation through Grant No. CHE-0096941
(Laren M. Tolbert).
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10 March 2005
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Headline
news:
A team of researchers at the Max Born Institut in Berlin
and the University of Toronto have solved the long standing
problem whether for liquid water O-H stretching vibrational
line shapes are determined by slowly varying hydrogen bond
networks or by rapidly fluctuating and interchanging configurations.
|
Pressemitteilung
"Das kurze Gedächtnis
des Wassers"
 Persbericht
"Zo vlug als water het geheugen
verliezen" |
| |
One sentence
summary:
The hydrogen bonding network of neat liquid water (H2O)
shows rearrangements and energy redistribution on time scales
much faster than any other liquid, underlining its particular
role in Nature. |
Press
Release
"The
short-term memory of water" |
| |
Link
to original paper
|
Press
Release
"Ultrafast Memory Loss
and Energy Redistribution in the Hydrogen Bond Network of
Liquid Water" |
| |
What are
O-H stretching and librational modes?
Examples given here. (click on images for animated gif-files
6 MB)
Stretching vibration of the water molecule. An ultrashort
infrared pulse excites the asymmetric stretching vibration
of the angled water molecule (red: oxygen atom, gray: hydrogen
atom). The water molecule is part of a network of hydrogen
bonds between the hydrogen and oxygen atoms on neighboring
molecules (small gray symbols). Shown are the elongations
of the atoms during the stretching vibration with a vibrational
period of 10 fs. (Animation by Jens Dreyer, MBI)
Librational motion of water. Librational motions change
the relative orientation of water molecules and - thus - contribute
to the loss of structural memory in the liquid. A period of
the librational mode shown lasts approximately 40 fs. (Animation
by Jens Dreyer, MBI)
|
Mikrokosmos:
Das geheimnisvolle Wesen Wasser
Article
by Manon Baukhage in P.M. Magazin (in German)
|
| |
Photos
R. J. Dwayne Miller, Erik T. J. Nibbering, Nils Huse, Michael
L. Cowan and Barry D. Bruner during the first round of experiments
in november 2003.
Nils Huse and Michael L. Cowan during measurements in August
2004.
|
More details on page of subproject
1
|
| |
Michael L. Cowan, Barry D. Bruner, R. J. Dwayne Miller, Thomas
Elsaesser and Erik T. J. Nibbering having a group meeting
during the boat trip at CMDVS 2004 in Madison, Wisconsin.
Barry D. Bruner, Nils Huse and Michael L. Cowan videoconferencing
from Toronto.
|
Contact: Erik T. J.
Nibbering
Contact: Thomas Elsaesser
Contact: R.
J. Dwayne Miller
Link to the Dwayne
Miller group home page at the University of Toronto
|
| |
External funding by:
German Science Foundation: SFB450-B2 (Sonderforschungsbereich
450 "Analyse und Steuerung ultraschneller photoinduzierter
Reaktionen")
Alexander von Humboldt Foundation (RJD Miller)
Canadian Foundation for Innovation
Natural Sciences and Engineering Research Council of Canada
Photonics Research Ontario
|
Link to SFB450
web-page
|
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22 July
2004
|
Headline news:
In a joint collaboration between the SFB450-B2 and SFB450-C1
projects run by the Elsaesser/Nibbering (Max Born Institut
for Nonlinear Optics and Short Pulse Spectroscopy) and Manz/Kühn
(Freie Universität Berlin) teams a combined experimental
and theoretical study reveals how O-H stretching excitation
in hydrogen bonds is redistributed . |
Link to original paper
|
| |
One sentence
summary:
Two colour infrared pump-probe measurements and quantum chemical
calculations on phthalic acid monomethylester demonstrate that
the O-H stretching excitation follows a cascaded energy redistribution
pathway along O-H bending and O-H out-of-plane deformation modes. |
More details
on page of subproject 1 |
| |
Karsten Heyne analysing the two colour pump-probe data on phthalic
acid monomethylester. |
Contact: Erik T. J.
Nibbering
Contact: Thomas Elsaesser
Contact: Oliver Kühn
|
| |
External funding by:
German Science Foundation: SFB450-B2 and C1 (Sonderforschungsbereich
450 "Analyse und Steuerung ultraschneller photoinduzierter
Reaktionen")
|
Link
to SFB450 web-page |
| |
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2 June 2004
|
Headline
news:
Erik T. J. Nibbering gives his opinion on the structure of
water in an interview with Michael Fuhs for Deutschlandfunk
|
Link
to transcribed interview |
| |
Forschung
aktuell • Aus Naturwissenschaft und Technik
Montag bis Freitag • 16:35
2.6.2004
Ketten und Ringe
Neue Erkenntnisse über die Struktur von flüssigem Wasser
Von Michael Fuhs
|
Link to sound file of interview |
| |
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| 31 March 2004 |
Headline news:
In a joint project between the Nibbering team (Max Born Institut
for Nonlinear Optics and Short Pulse Spectroscopy) and the Fidder
team (Uppsala Universitet) results on the ultrafast internal
conversion (IC) dynamics of a photochromic switch have lead
to a refinement of the well-established "energy gap law" for
IC, to a connection of two theoretical explanations for IC,
currently believed to be unrelated and to a prediction that
regulation of (photo-)chemical yields at the expense of photophysical
decay can be accomplished by active control of molecular conformations.
|
Link to original paper |
| |
One sentence
summary:
Large conformational changes upon electronic excitation explain
recent observations of ultrafast internal conversion while showing
behaviour different to that predicted by the well-established
"energy gap law". |
More details
on page of subproject 4 |
| |
 |
Contact: Erik T. J.
Nibbering
|
| |
Matteo Rini, Henk Fidder together with Omar F. Mohammed in
the femtosecond application laboratory.
|
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| |
External funding
by:
LIMANS Cluster of Large Scale Facilities: MBI000237
German Science Foundation: DFG NI 492/2-2 (Schwerpunktprogram
"Femtosekunden-Spektroskopie elementarer Anregungen in
Atomen, Molekülen und Clustern")
|
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| 25 February 2004 |
Headline news:
In a joint project between researchers from the Max Born Institut
for Nonlinear Optics and Short Pulse Spectroscopy, the University
of Würzburg, and the University of Louisville the structure
and dynamics of NO bound to myoglobin has been investigated
with ultrafast infrared polarisation spectroscopy and density
functional theory.
|
Link to original paper |
| |
One sentence
summary:
In a combined experimental and theoretical study of NO bound
to the heme iron in myoglobin it is found that the diatomic
ligand is severely tilted in the protein and that the Fe-NO
moiety can sample a wide range of off-axis tilting and bending
conformations. |
More details
on page of subproject 4 |
| |
 |
Contact: Erik T. J.
Nibbering
|
| |
Matteo Rini and Tomasz Zemojtel in the femtosecond application
laboratory.
|
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| |
External funding
by:
LIMANS Cluster of Large Scale Facilities: MBI000232
|
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| 28 November
2003 |
Headline news:
In the SFB450-B2 project run by the Elsaesser/Nibbering
team (Max Born Institut for Nonlinear Optics and Short Pulse
Spectroscopy) first two colour infrared pump-probe measurements
reveal how vibrational modes mutually interact in hydrogen
bonds. |
Link to original paper
|
| |
One sentence
summary:
Two colour infrared pump-probe measurements on acetic acid dimer
show the importance of anharmonic coupling between and the involvement
of different vibrational modes in this important model system
for hydrogen bonding. |
More details
on page of subproject 1 |
| |
Karsten Heyne analysing the two colour pump-probe data on acetic
acid dimer. |
Contact: Erik T. J.
Nibbering
Contact: Thomas Elsaesser |
| |
External funding by:
German Science Foundation: SFB450-B2 (Sonderforschungsbereich
450 "Analyse und Steuerung ultraschneller photoinduzierter
Reaktionen")
|
Link
to SFB450 web-page |
| |
|
|
| 7 November
2003 |
Headline news:
In the SFB450-B2 project run by the Elsaesser/Nibbering
team (Max Born Institut for Nonlinear Optics and Short Pulse
Spectroscopy) photon echo results have been reported on hydrogen
bond dynamics in acetic acid dimer, an important model system
for coupled hydrogen bonds in biomolecular structures. |
Link to original paper |
| |
One sentence
summary:
An infrared photon-echo study of the O-H stretching band of
acetic acid dimer reveals the dominant role of multi-level coherence
interferences in the macroscopic polarization decay. |
More details
on page of subproject 1 |
| |
Nils Huse measuring the photon echo data on acetic acid dimer. |
Contact: Erik T. J.
Nibbering
Contact: Thomas Elsaesser |
| |
External funding by:
German Science Foundation: SFB450-B2 (Sonderforschungsbereich
450 "Analyse und Steuerung ultraschneller photoinduzierter
Reaktionen")
|
Link
to SFB450 web-page |
| |
|
|
| 18 July
2003 |
Headline news:
Members of the Nibbering team (Max Born Institut for Nonlinear
Optics and Short Pulse Spectroscopy) in collaboration with
the Pines team (Ben-Gurion University of the Negev) observe
bimodal proton transfer dynamics in acid-base neutralization
reactions in water. |
Pressemitteilung
"Ab
jetzt bist du sauer!"
Säuren beim Reagieren zusehen |
| |
One sentence
summary:
Bimodal reaction dynamics, as observed in femtosecond infrared
measurements on proton transfer reactions in acid-base pairs
in water, demand refinement of the established Eigen-Weller
mechanism. |
Press Release
"From
now on you are sour"
Looking at reacting acids
|
| |
Summary showing the essence
of the work |
Persbericht
"Vanaf nu reageer je zuur!"
Kijken naar reagerende zuren |
| |
Link to
original paper |
Comunicato
stampa
"Da
questo momento siate acidi!"
Osservare il movimento dei protoni durante reazioni chimiche
|
| |
Link to Perspective by Mark A. Johnson |
Two
fast studies of liquid water |
| |
The team members (left to right): Ben-Zion (Oleg) Magnes, Ehud
Pines, Erik T. J. Nibbering and Matteo Rini |
 Pressemitteilung
|
| |
|
More details
on page of subproject 2 |
| |
External funding
by:
German Science Foundation: DFG NI 492/2-2 (Schwerpunktprogram
"Femtosekunden-Spektroskopie elementarer Anregungen in
Atomen, Molekülen und Clustern")
German-Israeli Foundation for Scientific Research and Development:
GIF 722/01
LIMANS Cluster of Large Scale Facilities: MBI000228 |
Contact: Erik T. J.
Nibbering |
| |
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10 July
2003
|
Headline news:
"Carl-Ramsauer Preis" für Dr. Jens Stenger
Physiker des Max-Born-Instituts erhält Preis für die Untersuchung
von Wasserstoffbrücken. |
Pressemitteilung
Was
die lebendige Welt im Innersten zusammenhält |
| |
Dr. Jens Stenger in full action at the Carl Ramsauer Preisverleihung.
The Carl Ramsauer prizewinners in one row.
Official flyer announcing 2003 Carl Ramsauer prize winners
|
Carl
Ramsauer prize winners on the official site of the Physikalische
Gesellschaft zu Berlin |
| |
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| 12 March 2003 |
Headline news:
In a joint project between the Nibbering team (Max Born Institut
for Nonlinear Optics and Short Pulse Spectroscopy) and the Fidder
team (Uppsala Universitet) competing ultrafast relaxation channels
are observed in optically induced chemical reaction dynamics
of the photochromic switch spiropyran.
|
Link to original paper |
| |
One sentence
summary:
Ultrafast internal conversion to the spiropyran ground state
is found to be an efficient relaxation channel competing with
the photochemically induced ring-opening reaction to merocyanine.
|
More details
on page of subproject 4 |
| |
 |
Contact: Erik T. J.
Nibbering
|
| |
Matteo Rini, Henk Fidder together with Omar F. Mohammed in
the femtosecond application laboratory.
|
|
| |
External funding
by:
LIMANS Cluster of Large Scale Facilities: MBI000237
German Science Foundation: DFG NI 492/2-2 (Schwerpunktprogram
"Femtosekunden-Spektroskopie elementarer Anregungen in
Atomen, Molekülen und Clustern")
|
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| 28 February 2003 |
Headline news:
In the SFB450-B2 project run by the Elsaesser/Nibbering team
(Max Born Institut for Nonlinear Optics and Short Pulse Spectroscopy)
new results have been reported on hydrogen bond dynamics in
acetic acid dimer, an important model system for coupled hydrogen
bonds in biomolecular structures. |
Link to original paper |
| |
One sentence summary:
The cyclic dimer of deuterated acetic acid, an important model
system for hydrogen-bonded units of biomolecules, shows, upon
excitation of the O–D stretching mode, coherent nuclear motions
along several anharmonically coupled intermolecular low-frequency
modes of the dimer. |
More details
on page of subproject 1 |
| |
Karsten Heyne fitting the acetic acid dimer pump-probe data. |
Contact: Erik T. J.
Nibbering
Contact: Thomas Elsaesser |
| |
External funding by:
German Science Foundation: SFB450-B2 (Sonderforschungsbereich
450 "Analyse und Steuerung ultraschneller photoinduzierter
Reaktionen")
|
Link
to SFB450 web-page |
| |
|
|
| 15 January 2003 |
Headline news:
A new procedure to simulate multidimensional nonlinear vibrational
spectra based on electronic structure ab initio calculations
has been developed by Jens Dreyer in collaboration with the
group of Shaul Mukamel (University of Rochester / UC Irvine). |
Link to original
paper |
| |
One sentence
summary:
Analysis of a complete set of simulated one- and two-color
multidimensional infrared spectra, which provide new insight
into structural and dynamical properties of molecules and chemical
reactions with ultrafast time resolution, shows distinct and
direct signatures of anharmonicities, mode couplings, Fermi
resonances, and relative transition dipole moments. |
More details
on page of subproject 5 |
| |
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Contact: Jens Dreyer
|
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| 8 July 2002 |
Headline news:
Scientists at the Max Born Institute demonstrate the importance
of non-totally symmetric vibrational modes for intramolecular
vibrational energy redistribution (IVR) processes that take
place after relaxation from photochemically excited state to
the ground state (internal conversion, IC) through conical intersections.
|
Link to original
paper |
| |
One sentence
summary:
Picosecond anti-Stokes resonance Raman spectroscopy of para-nitroaniline
reveals initial excitation of out-of-plane vibrations, which
thus represent the main accepting modes, whereas excitation
of totally-symmetric vibrations by IVR occurs only in subsequent
step - a new model, which contrasts earlier treatments of internal
conversion. |
More details
on page of subproject 3 |
| |
Wolfgang Werncke and Valeri Kozich contemplating the picosecond
Raman set-up. |
Contact: Wolfgang Werncke
Contact: Thomas Elsaesser |
| |
External funding by:
German Science Foundation: DFG DFG WE 1489/5 |
|
| |
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| 24 June 2002 |
Headline news:
Erik T. J. Nibbering reported the first femtosecond infrared
experiment on excited state intramolecular hydrogen transfer
(ESIHT) at the Faraday Discussion meeting 122: Time-Resolved
Chemistry: From Structure to Function. |
Link to original
paper |
| |
One sentence
summary:
Femtosecond infrared experiments on infrared-active fingerprint
vibrations of 2-(2'-hydroxyphenyl)benzothiazole (HBT)excited
state reveal an intramolecular hydrogen transfer (ESIHT) time
scale of 30-50 fs, followed by intramolecular vibrational redistribution
and cooling on picosecond times, without being the direct energy
accepting modes during the reaction. |
More details
on page of subproject 2 |
| |
External funding by:
German Science Foundation: DFG NI 492/2-2 (Schwerpunktprogram
"Femtosekunden-Spektroskopie elementarer Anregungen in
Atomen, Molekülen und Clustern") |
Contact: Erik T. J.
Nibbering
Contact: Thomas Elsaesser |
| |
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|
| 14 March 2002 |
Headline news:
Scientists at the Max Born Institut for Nonlinear Optics and
Short Pulse Spectroscopy report for the first time an infrared
photon echo peak shift study of liquid water, giving insight
into the time scales of fluctuations of the hydrogen bond network
in water. |
Link to original paper |
| |
One sentence summary:
A photon echo peak shift study of the O-H stretching band of
HOD in deuterated water shows that spectral diffusion occurs
on many time scales, indicating that the memory of local structure
of the hydrogen bond network in liquid water remains (partially)
conserved well up to several picoseconds. |
More details
on page of subproject 1 |
| |
Uni Zuerich and MBI-team members Peter Hamm, Erik T. J. Nibbering,
Julian Edler and Jens Stenger in Vancouver, just before the
Ultrafast Phenomena XIII conference (May 2002), at which the
work was presented to an international audience.
|
Contact: Erik T. J.
Nibbering
Contact: Thomas Elsaesser |
| |
External funding by:
German Science Foundation: SFB450-B2 (Sonderforschungsbereich
450 "Analyse und Steuerung ultraschneller photoinduzierter
Reaktionen")
|
Link
to SFB450 web-page |
|
|
|
| 9 July 2001 |
Headline news:
Scientists at the Max Born Institut for Nonlinear Optics and
Short Pulse Spectroscopy report for the first time an infrared
photon echo study of liquid water. |
Link to original paper |
| |
One sentence summary:
The ultrafast dephasing time of the O-H stretching mode of HOD
in deuterated water is rationalized by taking into account the
large anharmonicity of hydrogen-bonded O-H stretching modes. |
More details
on page of subproject 1 |
| |
Jens Stenger in full action measuring IR photon echoes |
Contact: Erik T. J.
Nibbering
Contact: Thomas Elsaesser |
| |
External funding by:
German Science Foundation: SFB450-B2 (Sonderforschungsbereich
450 "Analyse und Steuerung ultraschneller photoinduzierter
Reaktionen")
|
Link
to SFB450 web-page |
| |
|
|
| 5 April 2001 |
Headline news:
Scientists at the Max Born Institut for Nonlinear Optics and
Short Pulse Spectroscopy show for the first time that coherent
motions in hydrogen bonds can be driven with ultrahsort infrared
laser pulses. |
Link to original paper |
| |
One sentence summary:
Femtosecond infrared spectroscopy on a medium-strong intramolecular
hydrogen bond shows that ultrafast excitation of a O-D stretching
mode facilitates coherent underdamped motions of an anharmonically
coupled low-frequency mode. |
More details
on page of subproject 1 |
| |
Dorte Madsen in full action measuring wavepackets on hydrogen
bonds. |
Contact: Erik T. J.
Nibbering
Contact: Thomas Elsaesser |
| |
External funding by:
German Science Foundation: SFB450-B2 (Sonderforschungsbereich
450 "Analyse und Steuerung ultraschneller photoinduzierter
Reaktionen")
|
Link
to SFB450 web-page |
|
|
|
| 22 March 2000 |
Headline news:
The combined approach of ultrafast vibrational spectroscopy
and high-level excited-state CASSCF calculations provides valuable
new information on the structural dynamics of photochemical
reactions. |
Link to original paper |
| |
One sentence summary:
A detailed theoretical analysis of femtosecond transient infrared
spectra to determine excited-state structures involved in photoinduced
intramolecular charge transfer (ICT) in 4-(dimethylamino)benzonitrile
rules out the rehybridized ICT (RICT) model, favors the twisted
ICT (TICT) model over the the pseudo Jahn-Teller ICT( (PICT)
model, and predicts that observation of the phenyl-amino stretching
vibration allows to discriminate clearly between the TICT and
PICT models. |
Contact: Jens Dreyer
|
| |
Jens Dreyer working on ab initio calculations. |
|
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|
| 29 October 1999 |
Headline news:
Scientists at the Max Born Institute report for the first time
the direct observation of vibrational population dynamics following
an elementary photoinduced reaction in Betaine-30. |
Link to original paper |
| |
One sentence
summary:
Picosecond anti-Stokes resonance Raman spectroscopy shows selective
excitation of vibrations immediately after back electron transfer
resulting in pronounced excess populations of the few strongest
high-frequency Raman-active modes, whereas thermalization of
the vibrations occurs on a rather slow 10 picosecond time scale. |
|
| |
Wolfgang Werncke and Sebastian Wachsmann-Hogiu with the resonance
Raman laser set-up. |
|
| |
External funding by:
German Science Foundation: DFG WE 1489/5 |
Contact: Wolfgang Werncke
Contact: Thomas Elsaesser |
| |
|
|
| 22 July 1999 |
Headline news:
Scientists at the Max Born Institut for Nonlinear Optics and
Short Pulse Spectroscopy show in an infrared solvation dynamics
study of hydrogen-bonded coumarin 102-phenol complexes, that
hydrogen-bond rearrangements are important in liquid phase molecular
dynamics. |
Link to original paper |
| |
One sentence summary:
The ultrafast structural response of hydrogen bonds in complexes
between coumarin 102 and phenol to a change in electronic charge
distribution in the dye is studied with ultrafast infrared spectroscopy,
revealing prompt hydrogen-bond breaking between the coumarin
dye and phenol, and subsequent geometric rearrangement of phenol-complexes. |
|
| |
Christian Chudoba and Erik T. J. Nibbering with the femtosecond
infrared laser set-up. |
|
| |
External funding by:
German Science Foundation: DFG NI 492/2-2 (Schwerpunktprogram
"Femtosekunden-Spektroskopie elementarer Anregungen in
Atomen, Molekülen und Clustern") |
Contact: Erik T. J.
Nibbering
Contact: Thomas Elsaesser |
|
|
|
| 5 October 1998 |
Headline news:
Scientists at the Max Born Institut for Nonlinear Optics and
Short Pulse Spectroscopy report for the first time an infrared
solvation dynamics study of a coumarin dye, giving site-specific
insight into hydrogen bond dynamics in liquid solution. |
Link to original paper |
| |
One sentence
summary:
Site-specific femtosecond infrared spectroscopy of the hydrogen
bond between a coumarin dye and chloroform shows that this local
hydrogen bond is broken when the electronic charge distribution
in the coumarin dye is changed by optical excitation. |
|
| |
MBI-team members in the mountains near Garmisch-Partenkirchen,
after the Ultrafast Phenomena XI conference (July 1998) at which
the work was first presented to an international audience. Left
to right: Erik T. J. Nibbering, Christoph Lienau, Christian
Chudoba and Mike P. Hasselbeck. |
|
| |
External funding by:
German Science Foundation: DFG NI 492/2-2 (Schwerpunktprogram
"Femtosekunden-Spektroskopie elementarer Anregungen in
Atomen, Molekülen und Clustern") |
Contact: Erik T. J.
Nibbering
Contact: Thomas Elsaesser |
|
|
|
| 20 December 1996
|
Headline
news:
The Elsaesser team (Max Born Institut for Nonlinear Optics and
Short Pulse Spectroscopy) shows that in excited state intramolecular
hydrogen transfer (ESIHT) Raman-active low-frequency modes,
that modulate the hydrogen bond distance, are coherently excited. |
Link to original paper
|
| |
One sentence
summary:
Ultrafast excited state hydrogen transfer in 2-(2'-hydroxy-5'-methylphenyl)-benzotriazole
show coherent vibrational motions during and after hydrogen
transfer. |
Contact: Thomas Elsaesser |
| |
Link to Perspective by A. Douhal |
|
| |
Dr. Nibbering
