Resonance vibrational Raman optical activity: A time-dependent density functional theory approach

被引:65
|
作者
Jensen, L.
Autschbach, J.
Krykunov, M.
Schatz, G. C.
机构
[1] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA
[2] SUNY Buffalo, Dept Chem, Buffalo, NY 14260 USA
来源
JOURNAL OF CHEMICAL PHYSICS | 2007年 / 127卷 / 13期
基金
美国国家科学基金会;
关键词
D O I
10.1063/1.2768533
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
We present a method to calculate both on- and off-resonance vibrational Raman optical activities (VROAs) of molecules using time-dependent density functional theory. This is an extension of a method to calculate the normal VROA by including a finite lifetime of the electronic excited states in all calculated properties. The method is based on a short-time approximation to Raman scattering and is, in the off-resonance case, identical to the standard theory of Placzek. The normal and resonance VROA spectra are calculated from geometric derivatives of the different generalized polarizabilites obtained using linear response theory which includes a damping term to account for the finite lifetime. Gauge-origin independent results for normal VROA have been ensured using either the modified-velocity gauge or gauge-included atomic orbitals. For the resonance VROA only the modified-velocity gauge has been implemented. We present some initial results for H2O2 and (S)-methyloxirane and compare with predictions from a simple two-state approximation.
引用
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页数:11
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