Ultrafast dynamics of lattice relaxed states in quasi-one-dimensional MX-chain compounds

被引：10
|
作者：
Wada, Y
Matsushita, N
Haneda, H
机构：
[1] Natl Inst Mat Sci, Adv Mat Lab, Tsukuba, Ibaraki 3050044, Japan
[2] Univ Tokyo, Grad Sch Arts & Sci, Dept Chem, Meguro Ku, Tokyo 1538902, Japan
来源：
JOURNAL OF LUMINESCENCE | 2004年 / 108卷 / 1-4期
关键词：
polarons and electron-phonon interactions; optical properties of low-dimensional structures; MX-chain; solitons; coherent phonons; lattice relaxation; self-trapped excitons; transient absorption;
D O I：
10.1016/j.jlumin.2004.01.061
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Ultrafast relaxation processes of photoexcited states in a quasi-one-dimensional halogen-bridged mixed-valence metal complex [Pt(en)(2)][Pt(en)(2)I-2](SO4)(2).6H(2)O have been investigated by femtosecond transient absorption spectra measurements. A photoinduced absorption band caused by non-thermalized self-trapped excitons has been found. Oscillation of the absorption band caused by the symmetric Pt-I stretching mode of the self-trapped exciton with a frequency of 103 cm(-1) has been observed. The rise time of a polaron absorption band has been measured to be 1.2 ps. This corresponds to the decay time, 1.1 ps, of a photoinduced absorption band which oscillates with a frequency of 74 cm(-1). (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码：285 / 289
页数：5
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