三种脉冲紫外光光子回波技术在溶液中分子的研究：啁啾的影响。

Three pulse UV photon echo studies of molecules in solution: effect of the chirp.

机构信息

Laboratoire de Spectroscopie Ultrarapide, ISIC, FSB, Ecole Polytechnique Fédérale de Lausanne, Station 6, CH-1015 Lausanne, Switzerland.

出版信息

J Chem Phys. 2010 Aug 14;133(6):064506. doi: 10.1063/1.3463448.

DOI:10.1063/1.3463448

PMID:20707574

Abstract

We report on the electronic dephasing times of the nonpolar chromophore diphenylacetylene (DPA) in ethanol and in cyclohexane (polar and nonpolar solvents respectively) by photon echo measurements in the ultraviolet. Contrary to previous reports, we observed sub-100-fs electronic dephasing times for DPA in both solvents. We identify fast dynamics of tau=40+/-10 fs on the photon echo peak shift (PEPS) traces of DPA in ethanol. In addition, we observed a dependence of the PEPS asymptotic value on the temporal chirp of the pulses. We propose a model to describe it in terms of phase-matching condition and beam geometry.

摘要

我们通过紫外光下的光子回波测量报告了非极性生色团二苯乙炔（DPA）在乙醇和环己烷（分别为极性和非极性溶剂）中的电子退相时间。与以前的报告相反，我们观察到 DPA 在这两种溶剂中的电子退相时间都短于 100fs。我们在 DPA 的乙醇光回波峰位移（PEPS）迹线中识别出了快达 40+/-10fs 的动力学。此外，我们还观察到 PEPS 渐近值与脉冲的时间啁啾有关。我们提出了一个模型，根据相位匹配条件和光束几何形状来描述它。