Table of Contents
Laser Chemistry
Volume 2, Issue 5-6, Pages 271-283
http://dx.doi.org/10.1155/LC.2.271

Intramolecular Vibrational Redistribution at Low State Densities in S1 Aromatics. Evidence for Rotational Contributions

1Department of Chemistry, Indiana University, Bloomington 47405, IN, USA
2School of Sciences, Griffith University, Nathan 4111, Queensland, Australia

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.

Abstract

Evidence is presented concerning the onset of intramolecular vibrational redistribution (IVR) as one climbs the vibrational manifold of room temperature S1 aromatics. The onsets of IVR occur at S1 vibrational energies between 670 and 2000 cm−1 for various single and double ring aromatic molecules. The vibrational level densities in the onset region seem too small to support the extensive IVR that is observed in every molecule. Comparisons of room temperature fluorescence spectra with cold supersonic beam spectra from p-difluorobenzene support the proposition that Coriolis vibration–rotation coupling makes important contributions to the effective density of states in room temperature IVR.