Femtosecond investigations of photophysics of ultrafast intersystem crossing in terthiophene by wavelength dependent excitation

被引：34

作者：

Yang, JP ^{[1
]}

Paa, W ^{[1
]}

Rentsch, S ^{[1
]}

机构：

[1] Univ Jena, Inst Opt & Quantum Elect, D-07743 Jena, Germany

来源：

CHEMICAL PHYSICS LETTERS | 2000年 / 320卷 / 5-6期

关键词：

D O I：

10.1016/S0009-2614(00)00264-5

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：

Ultrafast intersystem crossing (ISC) and triplet generation in terthiophene (3T) was investigated by femtosecond time-resolved spectroscopy in dependence of excitation wavelengths. Triplet yield was monitored by examining transient spectra of the triplet absorption band. We find that triplets are generated by different processes: (i) ISC starting from the lowest vibrational S-1 state and (ii) ultrafast ISC from an intermediate state. We discuss the probable formation mechanism and the nature of the intermediate state. The results suggest that a planarisation process of excited twisted conformers, which proceeds on a 2 ps time scale, is responsible for the highly effective triplet generation. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：665 / 672

页数：8

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