Time-domain chirally-sensitive three-pulse coherent probes of vibrational excitons in proteins

被引：17

作者：

Abramavicius, D ^{[1
]}

Mukamel, S ^{[1
]}

机构：

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

来源：

CHEMICAL PHYSICS | 2005年 / 318卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

nonlinear response; four-wave mixing; excitons; nonlinear exciton equations;

D O I：

10.1016/j.chemphys.2005.06.046

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 third-order optical response of Bosonic excitons is calculated using the Green's function solution of the nonlinear exciton equations (NEE), which establish a quasi particle-scattering mechanism for optical nonlinearities. Both time-ordered and non-ordered forms of the response function which represent time and frequency domain techniques, respectively, are derived. New components of the response tensor are predicted for isotropic ensembles of periodic chiral structures to first order in the optical wavevector. The nonlocal nonlinear response function is calculated in momentum space. The finite exciton-exciton interaction length is used to greatly reduce the computational effort. Applications arc made to coupled anharmonic vibrations in the amide I infrared band of peptides. Chirally sensitive and non-sensitive signals for alpha helices and antiparallel beta sheets are compared. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：50 / 70

页数：21

共 55 条

[1] Coherent third-order spectroscopic probes of molecular chirality [J].