Characterization of excited electronic states of naphthalene by resonance Raman and hyper‐Raman scattering
Characterization of excited electronic states of naphthalene by resonance Raman and hyper‐Raman scattering
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通过共振拉曼和超拉曼散射表征萘的激发电子态
DOI：
10.1063/1.463797
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
S. M. Cameron
中科院分区：
文献类型：
--
作者：
C. C. Bonang;S. M. Cameron
报道了萘的第一共振拉曼和超拉曼散射。锁模Nd：YAG激光器的四次谐波用于共振激发1B 1u+跃迁，产生拉曼光谱，证实振动活性ν28（b3 g）模式和Franck-Condon活性ag模式ν5和ν3占主导地位。采用同步泵浦的二苯乙烯染料激光器及其二次谐波作为激发源，研究了重叠的1B 2u+和1Ag−态的超拉曼和拉曼散射。拉曼光谱表明，萘的平衡几何构型在1B 2 u+激发下主要沿沿着ν5、ν8和ν7正常坐标发生畸变.超拉曼光谱显示ν25（b2 u）是主要负责1Ag−和1B 2u+态之间电子振动耦合的模式。结果表明，共振超拉曼散射的情况下，重叠的单光子和双光子允许跃迁的有利功能。基于简单分子轨道构型的计算。
The first resonance Raman and hyper‐Raman scattering from naphthalene are reported. Fourth harmonic of a mode‐locked Nd:YAG laser is used to resonantly excite the 1B1u+ transition, producing Raman spectra that confirm the dominance of the vibronically active ν28 (b3g) mode and the Franck–Condon active ag modes, ν5 and ν3. A synchronously pumped stilbene dye laser and its second harmonic are employed as the excitation sources for hyper‐Raman and Raman scattering from the overlapping 1B2u+ and 1Ag− states. The Raman spectra indicate that the equilibrium geometry of naphthalene is distorted primarily along ν5, ν8, and ν7 normal coordinates upon excitation to 1B2u+. The hyper‐Raman spectrum shows that ν25 (b2u) is the mode principally responsible for vibronic coupling between the 1Ag− and 1B2u+ states. The results demonstrate the advantageous features of resonance hyper‐Raman scattering for the case of overlapping one‐ and two‐photon allowed transitions. Calculations based on simple molecular orbital configur...