Table of Contents
Laser Chemistry
Volume 3, Issue 1-6, Pages 109-132

Picosecond Processes in Chemical Systems: Vibrational Relaxation

Department of Chemistry, University of Pennsylvania, Philadelphia 19104, PA, USA

Copyright © 1983 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A review is presented of our recent studies of vibrational energy relaxation of moderately sized molecules in a variety of media and of the effect of vibrational relaxation on processes such as molecular rearrangements.

Data are presented on intramolecular dynamical processes involving p-difluorobenzene and an experiment is described which allows the study of spectral evolution on the picosecond timescale under collision-free conditions.

The vibrational (T1) relaxation of the apparently simple system consisting of a diatomic CN ion in aqueous solution was studied and found to be in the range of a few picoseconds and to be concentration dependent. These results, and the effects of counterions, are suggested to be the result of aggregation of the ions. A discussion of the Raman lineshapes is given in relation to the measured T1 times.