MULTILEVEL VIBRATIONAL DEPHASING AND VIBRATIONAL ANHARMONICITY FROM INFRARED PHOTON-ECHO BEATS

被引：59

作者：

TOKMAKOFF, A

KWOK, AS

URDAHL, RS

FRANCIS, RS

FAYER, MD

机构：

[1] Department of Chemistry, Stanford University, Stanford

来源：

CHEMICAL PHYSICS LETTERS | 1995年 / 234卷 / 4-6期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0009-2614(95)00068-F

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：

Vibrational photon echo experiments were performed on the asymmetric CO stretching mode of tungsten hexacarbonyl in glassy dibutylphthalate as a function of temperature using sub-picosecond infrared pulses (1976 cm(-1)) from a flee electron laser. The echo decays display pronounced beats and are bi-exponential. The beats and bi-exponential decays arise because the bandwidth of the pulses exceed the vibrational anharmonicity, leading to the excitation and dephasing of a multilevel coherence. From the beat frequency, the anharmonicity is determined to be 14.7 cm(-1). From the bi-exponential decay components, the temperature-dependent vibrational dephasing of both the upsilon = 0 --> 1 and upsilon = 1 --> 2 transitions are determined.

引用

页码：289 / 295

页数：7