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Lecture Erik T.J. Nibbering


08 October 2004 FWN-Building 5116.0116, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. Erik T.J. Nibbering
Affiliation: Max Born Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Berlin
Title: Biomodal proton transfer dynamics in acid-base pairs in water
Date: Fri Oct 8, 2004
Start: 11.00
Location: FWN-Building 5116.0116
Host: J. Knoester
Telephone: +31 50 363 4369


Proton transfer is a key chemical process in elementary phenomena such as acid-base neutralization and enzymatic reactions, the abnormal high proton mobility and the autoionization in water, and proton pumps through membrane protein channels. We investigate the fundamental acid-base neutralization reaction in liquid water with femtosecond mid-infrared spectroscopy. We use a photoacid, that upon photoexcitation reacts with a base, and monitor how the bimolecular reaction dynamics proceeds by inspection of appropriate vibrational marker modes of reactants and products. We observe bimodal reaction dynamics, that we ascribe to contributions from pre-formed hydrogen bonding complexes and from initially uncomplexed acid and base. Our results demand refinement of the well-established Eigen-Weller model.
Last modified:22 October 2012 2.30 p.m.