Author: Huang Tzer-Hsiang Hsu Chia-Chen Wei Tai-Huei Chen Michael Jiunn Tse Wan-Sun Chiang Hai-Pang Kuo Chie-Tong Chang Springfield Gu Xi-Jia
Publisher: Taylor & Francis Ltd
ISSN: 1362-3028
Source: Molecular Physics, Vol.96, Iss.3, 1999-02, pp. : 389-396
Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.
Abstract
The ultrafast inter- and intramolecular dynamics of liquid CBrCl are studied with a femtosecond laser in a pump/probe optical Kerr experiment. The prompt part of the observed Kerr signal is found to comprise not just electronic response but also coherent coupling. As reported in the literature, the weak and delayed part of the signal is attributed to three kinds of intermolecular dynamics: diffusive reorientation, polarizability distortion, and molecular libration with decay times, respectively, of 2ps, 500fs, and 190fs. Included in the delayed Kerr signal are long lasting oscillations which are ascribed to quantum interference involving four normal vibrations of the molecule. By a careful fitting of both the time domain (Kerr) and frequency domain (Raman) data with existing theories the four vibrations are identified as upsilon2 = 422cm-1, upsilon3 = 246cm-1, upsilon5 = 295cm-1, and upsilon6 = 191cm-1, with dephasing times, 1.1ps, 1.7ps, 1ps, and 1ps, respectively.