Real-time vibrational mode-coupling associated with ultrafast geometrical relaxation in polydiacetylene induced by sub-5-fs pulses

被引：89

作者：

Kobayashi, T

Shirakawa, A

Matsuzawa, H

Nakanishi, H

机构：

[1] Univ Tokyo, Sch Sci, Dept Phys, Tokyo 1130033, Japan

[2] Tohoku Univ, Inst Chem React Sci, Sendai, Miyagi 9808577, Japan

来源：

CHEMICAL PHYSICS LETTERS | 2000年 / 321卷 / 5-6期

基金：

日本学术振兴会;

关键词：

D O I：

10.1016/S0009-2614(00)00282-7

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：

The relaxation time of the free-exciton --> geometrically relaxed 2(1)A(g) state in polydiacetylene is determined as 65-80 fs, depending on the probe energy. The vibrational non-equilibrium in the relaxed 2(1)A(g) state is characterized by the modulations of instantaneous frequencies and amplitudes of C-C and C-C stretching modes with a 145-fs oscillation period. The frequency modulation is anti-phase between the two modes, and the amplitude and frequency are also anti-phase for both modes. These are explained by the coupling of the stretching modes through an in-plane bending mode with 230 cm(-1). This is the first real-time observation of dynamic vibrational mode coupling. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：385 / 393

页数：9

共 35 条

[1] Femtosecond time resolved molecular dynamics of a polydiacetylene backbone [J].