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Lecture Andrei Tokmakoff


20 February 2006 FWN-Building 5114.0004, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. Andrei Tokmakoff
Affiliation: Department of Chemistry, MIT
Title: Probing the mechanism of hydrogen bond rearrangements in water with 2D IR spectroscopy
Date: Mon Feb 20, 2006
Start: 16.00
Location: FWN-Building 5114.0004
Host: J. Knoester
Telephone: +31 50 363 4369


Two-dimensional infrared spectroscopy has been used to investigate the configurational fluctuations and rearrangements of hydrogen bonds in water through the characterization of time dependent changes to the OH vibrational frequency of HOD in D2O. Femtosecond fluctuations in hydrogen bonding distances an angles precedes activated switching of hydrogen bonded partners on picosecond time scales. The <150 fs relaxation of molecules excited in non-hydrogen bonded configurations indicates that dangling hydrogen bonds are not stable, but are a transition state of the concerted switching of hydrogen bonded partners. The possible mechanisms for this process will be discussed.
Last modified:22 October 2012 2.30 p.m.