Experimental study of the second-order non-linear optical properties of tetrathia-[7]-helicene

被引：56

作者：

Clays, K

Wostyn, K

Persoons, A

Stefano, MB

Maiorana, S

Papagni, A

Daul, CA

Weber, V

机构：

[1] Univ Louvain, Dept Chem, B-3001 Louvain, Belgium

[2] Univ Milan, Dipartimento Chim Organ & Ind, I-20133 Milan, Italy

[3] Univ Milan Bicocca, Dipartimento Sci Mat, I-20125 Milan, Italy

[4] Univ Fribourg, Dept Chem, CH-1700 Fribourg, Switzerland

来源：

CHEMICAL PHYSICS LETTERS | 2003年 / 372卷 / 3-4期

关键词：

D O I：

10.1016/S0009-2614(03)00437-8

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：

Femtosecond hyper-Rayleigh scattering (HRS) experiments as a function of amplitude modulation frequency have been performed on tetrathia-[7]-helicene. The apparent first hyperpolarizability beta(app)(omega) is a decreasing function of increasing frequency omega, due to the two-photon fluorescence (2PF) contribution. We observe, however, for the first time, also a frequency-dependent HRS depolarization ratio rho(omega). An accurate value for rho is important, since it offers an indication for the symmetry of the chromophore (5, resp. 1.5, for dipoles, resp. octopoles, but also independent of frequency, since identical for HRS and 2PF). For helicoidal symmetry p(omega) is increasing for higher frequencies, in agreement with theory. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

页码：438 / 442

页数：5

共 26 条

[1] Molecular crystal architecture and optical properties of a thiohelicenes series containing 5, 7, 9, and 11 rings prepared via photochemical synthesis [J].