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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Out-of-Plane Modes of cis-1,3,5-Hexatriene: Frequency Shifts in the 2~1A_1 and 1~1B_1 Excited States
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Out-of-Plane Modes of cis-1,3,5-Hexatriene: Frequency Shifts in the 2~1A_1 and 1~1B_1 Excited States

机译:顺式1,3,5-己三烯的平面外模式:2〜1A_1和1〜1B_1激发态的频移

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摘要

The calculation of Hessian matrices for the out-of-plane modes of cis-I,3,5-hexatriene -(CHT)in the IIA1, 2IA" and l'B, states is reported at the equilibrium geometry of the electronic ground state. The complete- activ~-space self-consistent-field (CASSCF) electronic structure model is employed. Jl and a orbitals are included in the active space to account for the mixing of both types of molecular orbitals at nonplanar conformations of CHT. On the basis of the Hessian matrices and the resulting approximate normal frequencies, an interpretation of recent spectroscopic evidence for the valence excited states of CHT is attempted. In particular, we make assignments of transitions in the low-frequency region of the hv + hv resonance enhanced multiphoton ionization (REMPI) spectrum of the 2 I A I state. The predicted excited-state frequencies appear to be accurate and normal coordinate rotations induced by electronic excitation are shown tbplay an important role for the intensity distributions observed by REMPI and resonance Raman spectroscopy.
机译:报告了IIA1、2IA“和l'B状态下顺式-I,3,5-己三烯-(CHT)的平面外模式的黑森州矩阵的计算,该状态是在电子基态的平衡几何上得出的。采用了完全激活空间自洽场(CASSCF)电子结构模型,其中J1和一个轨道包含在活动空间中,以说明两种类型的分子轨道在CHT的非平面构象上的混合。根据Hessian矩阵和由此产生的近似正态频率,尝试对CHT的价态激发态的最新光谱证据进行解释,特别是,我们对hv + hv共振的低频区域中的跃迁进行了分配2 IAI态的多光子电离(REMPI)光谱,预测的激发态频率似乎是准确的,并且显示了由电子激发引起的法向坐标旋转对于强度分布起着重要作用REMPI和共振拉曼光谱观察到的ns。

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