Vacuum ultraviolet resonance Raman studies of the excited electronic states of ethylene
Vacuum ultraviolet resonance Raman studies of the excited electronic states of ethylene
复制标题
乙烯激发电子态的真空紫外共振拉曼研究
DOI：
10.1063/1.456080
复制
发表时间：
1989
影响因子：
4.4
通讯作者：
B. Hudson
中科院分区：
文献类型：
--
作者：
R. Sension;B. Hudson
乙烯的共振拉曼研究已与使用的激发波长范围从200至141 nm。与V（ππ*）态共振的激发导致拉曼光谱显示C=C伸缩振动、CH 2对称剪刀振动、CH 2扭转振动和CH 2面外摇摆振动的强度。这些光谱证实了V态在C-C键附近有很强的扭曲。它们还表明C= CH 2基团在V态中不再是平面的。与（π3s）和（π 3 p）Rydberg跃迁的共振导致光谱在扭转振动、CH 2对称剪刀振动和CH 2摇摆振动中表现出小得多的强度。与（π3d）Rydberg跃迁共振获得的光谱再次表现出CH 2对称剪刀模的活性。
A resonance Raman study of ethylene has been performed with the use of excitation wavelengths ranging from 200 to 141 nm. Excitation resonant with the V(ππ*) state results in Raman spectra exhibiting intensity in the C=C stretching vibration, the CH2 symmetric scissors vibration, the CH2 torsional vibration and the CH2 out‐of‐plane wagging vibrations. These spectra confirm that the V state is strongly twisted about the C–C bond. They also indicate that the C=CH2 groups are no longer planar in the V state. Resonance with the (π3s) and (π3p) Rydberg transitions results in spectra exhibiting much less intensity in the torsional vibration, the CH2 symmetric scissors vibration and the CH2 wagging vibrations. The spectrum obtained in resonance with the (π3d) Rydberg transitions once again exhibits activity in the CH2 symmetric scissors mode.