期刊
JOURNAL OF CHEMICAL PHYSICS
卷 113, 期 17, 页码 7055-7061出版社
AMER INST PHYSICS
DOI: 10.1063/1.1313559
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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].
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