Table of Contents
Laser Chemistry
Volume 10 (1990), Issue 5-6, Pages 413-429

Solvation Dynamics Studied by Picosecond Fluorescence: Microscopic Reorientation and Longitudinal Relaxation of the Solvent

1Centre de Physique Moléculaire Optique et Hertzienne (C.P.M.O.H.), Unité Associée au C.N.R.S. U.A.283, Université de Bordeaux-I, 351, Cours de la Libération, Talence, Cédex 33405, France
2Laboratoire de Métallurgie Physique, U.A. 131 du C.N.R.S., 40, Avenue de Recteur Pineau, Poitiers, Cédex 86022, United Kingdom

Received 15 October 1989; Accepted 15 March 1990

Copyright © 1990 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.


The dynamics of the Time-Dependent Fluorescence Shift (TDFS) of a rigid polar excited probe dissolved in alcohol solvents at different temperatures have been studied by picosecond time-resolved spectroscopy. The results are compared to previously published results on well characterized polar systems. These results show that solvation dynamics in such systems are strongly scaled by the microscopic (singleparticle) reorientation time τM of the solvent molecules and/or by the (macroscopic) longitudinal relaxation time τL of the solvent. The key point governing this scaling is the relative interaction between the solvent molecules and the probe compared to the interaction between the solvent molecules. It is also shown that specific interactions, such as hydrogen bonded-complex formation, may play an important role.