Vibrational dissipation and dephasing of I2(v=1-19) in solid Kr

被引：29

作者：

Karavitis, M ^{[1
]}

Kumada, T ^{[1
]}

Goldschleger, IU ^{[1
]}

Apkarian, VA ^{[1
]}

机构：

[1] Univ Calif Irvine, Dept Chem, Irvine, CA 92697 USA

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2005年 / 7卷 / 05期

关键词：

D O I：

10.1039/b416143b

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：

Time- and frequency- resolved coherent anti- Stokes Raman scattering is used to carry out systematic measurements of vibrational dephasing on I-2( nu = 1 - 19) isolated in solid Kr, as a function of temperature, T = 7 - 45 K. The observed quantum beats, omega(nu', nu") allow an accurate reconstruction of the solvated molecular potential, which is well represented by the Morse form: omega(e) = 211.56 +/- 0.14, omega(e)x(e) = 0.658 +/- 0.006. Near T = 7 K, the coherence decay rates gamma(nu,0) become independent of temperature and show a linear nu-dependence, indicative of dissipation, which must be accompanied by the simultaneous creation of at least four phonons. At higher temperatures, the T- dependence is exponential and the nu- dependence is quadratic, characteristic of pure dephasing via pseudo- local phonons. A normal mode analysis suggests librations as the principle modes responsible for pure dephasing.

引用

页码：791 / 796

页数：6

共 34 条

[1]

BACHIR IH, 1993, CHEM PHYS, V177, P675, DOI 10.1016/0301-0104(93)85031-3

[2] The energy relaxation of a nonlinear oscillator coupled to a linear bath [J].