Resonance hyper-Raman scattering from conjugated organic donor-acceptor "push-pull" chromophores with large first hyperpolarizabilities
Resonance hyper-Raman scattering from conjugated organic donor-acceptor "push-pull" chromophores with large first hyperpolarizabilities
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DOI：
10.1021/ja036570r
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发表时间：
2003-09-03
影响因子：
15
通讯作者：
Blanchard-Desce, M
中科院分区：
文献类型：
--
作者：
Kelley, AM;Leng, WN;Blanchard-Desce, M
共振超拉曼光谱已经获得了使用1064 nm激发的几个电子供体受体取代，π共轭的“推挽”分子，具有大的二次谐波超极化率。超拉曼光谱与用532 nm激发测量的共振拉曼光谱几乎相同。这表明二次谐波超极化率和线性吸收都是由相同的单电子跃迁主导的，单光子和双光子都是允许的。共振拉曼和共振超拉曼光谱的比较，提出作为一个实验测试的共同的两个电子状态模型的第一超极化率。
Resonance hyper-Raman spectra have been obtained using 1064 nm excitation for several electron donor−acceptor-substituted, π-conjugated “push−pull” molecules that have large second harmonic hyperpolarizabilities. The hyper-Raman spectra are nearly identical to the resonance Raman spectra measured with 532 nm excitation. This indicates that both the second harmonic hyperpolarizability and the linear absorption are dominated by the same, single electronic transition that is both one- and two-photon allowed. Comparison of resonance Raman and resonance hyper-Raman spectra is proposed as an experimental test of the common two-electronic-state model for the first hyperpolarizability.