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Open seminar

演 題 「Solvation, H-Transfer and ultrafast dynamics in isolated molecular clusters from solvated electrons to DNA base pairs」
日 時 2006年05月22日(月) 16:00
講演者 Ingolf Hertel Max Born Institut for Nonlinear Optics and Short Pulse Spectroscopy Berlin-Adlershof, Germany
場 所

研究棟201セミナー室

概 要

Solvation phenomena play an important role in physical, chemical and biological processes. With femtosecond spectroscopy and the methods of cluster science it is possible to obtain a detailed understanding of photo-induced reactions in such systems. Photoelectron spectroscopy in particular has recently played an important role in gleaning new insight into solvation processes. In our group, a large number of model systems has been studied with the methods of ultrafast dynamics, ranging from simple sodium atoms embedded in water or ammonia clusters to complex micro-solvated DNA bases. Complementary studies of (static) photoemission from liquid water jets broaden our knowledge of solvation phenomena. In particular we will briefly dwell on the fingerprints of the H3O+ system in such environment.

Different aspects of this physics will be illustrated by prototypical examples: on one end we confront our results on the energetics and dynamics of solvated alkali atoms with results obtained for the solvated electron. The ammonia dimer will serve as a model system studying ultrafast hydrogen transfer. And a particular case of proton transfer, possibly crucial for the origin of life, will be demonstrated by di-amino-pyridine dimer, a model Watson-Crick base pair.