Femtosecond differential transmission spectroscopy of α-sexithienyl thin film at low temperature

被引：3
|
作者：
Urbasch, G [1 ]
Giessen, H
Murgia, M
Zamboni, R
Mahrt, RF
机构：
[1] Univ Marburg, Fachbereich Phys & Wissensch Zentrum Mat Wissensc, D-35032 Marburg, Germany
[2] CNR, Ist Spettroscopia Mol, I-40129 Bologna, Italy
[3] Max Planck Inst Polymerforsch, D-55128 Mainz, Germany
来源：
JOURNAL OF PHYSICAL CHEMISTRY B | 2000年 / 104卷 / 28期
关键词：
D O I：
10.1021/jp000747b
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：
We have reassessed the influence of the charge-transfer state on the photogeneration of free charges in alpha-sexithienyl. We performed femtosecond differential transmission spectroscopy on an a-sexithienyl film at low temperature, covering a broad range of excitation energies. In the probed spectral region from 2.0 to 2.8 eV we found a bleaching of the first excited singlet manifold with an excited-state absorption superimposed on the bleaching. During the first few picoseconds the dynamics of the photoexcitations in the range of the first excited singlet manifold are independent of the excitation photon energy, pointing to a negligible influence of the charge-transfer state. For longer delay times the spectra are dominated by thermal effects.
引用
收藏
页码：6536 / 6540
页数：5
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