The internal conversions of trans- and cis-1,3,5-hexatriene in cyclohexane solution studied with sub-50 fs UV pulses

被引：33

作者：

Anderson, NA

Durfee, CG

Murnane, MM

Kapteyn, HC

Sension, RJ

机构：

[1] Univ Michigan, Dept Chem, Ann Arbor, MI 48109 USA

[2] Univ Michigan, Ctr Ultrafast Opt Sci, Ann Arbor, MI 48109 USA

来源：

CHEMICAL PHYSICS LETTERS | 2000年 / 323卷 / 3-4期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0009-2614(00)00493-0

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Subpicosecond internal conversion dynamics of cis- and trans-1,3,5-hexatriene in cyclohexane were studied using sub 50 fs ultraviolet pulses. This time resolution allows direct observation of the 1B (S-2) and 2A (S-1) lifetimes. The 1B lifetime is 55 +/- 20 fs for trans-hexatriene, and less than or equal to 50 fs for cis-hexatriene. The subsequent 2A lifetime of trans-hexatriene is found to be 190 +/- 30.fs, and is controlled by the rate of intramolecular vibrational energy redistribution. The 2A lifetime in cis-hexatriene is 250 +/- 30 fs, and is affected by modification of the excited state potential energy surface from coupling with the solvent. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：365 / 371

页数：7

共 30 条

[1] Ultrafast polyene dynamics in solution:: The conformational relaxation and thermalization of highly excited cis-1,3,5-hexatriene as a function of initial conformation and solvent [J].