Table of Contents
Laser Chemistry
Volume 19, Issue 1-4, Pages 79-82
http://dx.doi.org/10.1155/1999/57652

Picosecond Raman Excitation Profile and Transient Absorption Spectrum of S1 Quaterphenyl in Solution

1Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom
2Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire 0Xll OQX, United Kingdom

Received 28 April 1997

Copyright © 1999 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

Intensity changes in Stokes resonance Raman spectra of photoexcited quaterphenyl are found to result from 17 ps timescale changes in resonance frequency and width and also in Franck-Condon displacements. The 766 cm-1 anti-Stokes band shows a significant hot population which decays on a similar timescale. The results show that population relaxation, vibronic coupling and solvent reorganisation are all significant on this timescale.