Observation of Resonance Hyper-Raman Scattering of all-trans-Retinal †
Observation of Resonance Hyper-Raman Scattering of all-trans-Retinal †
复制标题
全反式视网膜共振超拉曼散射的观察†
DOI：
10.1021/jp013174r
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发表时间：
2002
影响因子：
2.9
通讯作者：
T. Tahara
中科院分区：
文献类型：
--
作者：
M. Mizuno;H. Hamaguchi;T. Tahara
首次在室温溶液中测量了全反式视网膜的超拉曼散射。在双光子共振条件下，超拉曼散射强度非常强，可以在浓度低至1 × 10-3 mol dm-3的稀释溶液中测量。在激发波长770 ~ 840 nm （λex/ 2,385 ~ 420 nm）范围内检测了超拉曼激发谱。在此激发范围内，随着激发波长的缩短，各超拉曼波段的强度单调增加，其超拉曼光谱特征与激发能量加倍（λex/2）激发的共振拉曼光谱非常相似。讨论了超拉曼散射的共振机制，并得出结论：通过Franck - Condon （a项）机制，与“1Bu*”态而不是与“1Ag*”态的双光子共振可以增强超拉曼散射的强度。
Hyper-Raman scattering of all-trans-retinal was measured for the first time in solution at room temperature. Under the two-photon resonance condition, the intensity of hyper-Raman scattering was so strong that it could be measured from a diluted solution at a concentration as low as 1 × 10-3 mol dm-3. Hyper-Raman excitation profiles were examined in the excitation wavelength range from 770 to 840 nm (λex/2, 385−420 nm). In this excitation range, the intensity of all the hyper-Raman bands monotonically increased with shortening excitation wavelength, and the hyper-Raman spectral feature was very similar to that of resonance Raman spectra excited with double the excitation energy (λex/2). The resonance mechanism of hyper-Raman scattering was discussed, and it was concluded that hyper-Raman scattering gains intensity enhancement from a two-photon resonance with the “1Bu*” state, not with the “1Ag*” state, through the Franck−Condon (the A term) mechanism.