Table of Contents
Laser Chemistry
Volume 19, Issue 1-4, Pages 371-374

Femtosecond Transient Absorption Studies of Simple Polyenes in Solution

1Department of Chemistry, Kyoto University, Kyoto 606, Japan
2Institute for Molecular Science, Myodaiji, Okazaki 444, Japan

Received 8 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.


We have conducted femtosecond transient absorption experiments on the excited-state dynamics of trans- and cis-hexatriene (HT) in solution. The transient absorption in the visible region decays with the time constant of about 500 fs, indicating that the internal conversion (IC) to the ground state occurs quite efficiently. The bleach recovery signal contains several time constants. The vibrational relaxation in the ground state occurs in 10–20ps and the slow relaxation process, which may be due to the conformational change around C—C single bond, proceeds in a subnanosecond time scale.