Electronic and vibronic contributions to two-photon absorption of molecules with multi-branched structures

被引:234
作者
Macak, P [1 ]
Luo, Y
Norman, P
Ågren, H
机构
[1] Royal Inst Technol, S-10044 Stockholm, Sweden
[2] Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden
关键词
D O I
10.1063/1.1313559
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 electronic and vibronic contributions to the two-photon absorption of a series molecules with multi-branched structures have been studied using ab initio response theory. The results indicate that the electronic coupling between different branches alone cannot explain the experimental finding of a strong enhancement of the two-photon absorption cross section over the single branch structure, whereas it is predicted that vibronic contributions can play an important role in this respect. It is shown that for multi-branched molecules the use of circularly polarized light can increase the two-photon absorption cross section by a factor of 1.5 over linearly polarized light excitation. (C) 2000 American Institute of Physics. [S0021-9606(00)31041-8].
引用
收藏
页码:7055 / 7061
页数:7
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