Renner–Teller splitting in the C 1s→π* excited states of CS2, OCS, and CO2
Renner–Teller splitting in the C 1s→π* excited states of CS2, OCS, and CO2
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CS2、OCS 和 CO2 的 C 1s→π* 激发态中的 Renner-Teller 分裂
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
A. Yagishita
中科院分区：
文献类型：
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作者：
J. Adachi;N. Kosugi;E. Shigemasa;A. Yagishita
在CS2、OCS和CO2的C 1s→π*垂直跃迁（ΔΛ=+1）方向上，不仅可以观察到垂直（90°）方向的碎片离子，还可以观察到平行（0°）方向的碎片离子；也就是说，离子的动量与线性分子是正交的。这出现在具有弯曲平衡几何的c1s→平面内π*激发态的弯曲振动的Renner-Teller （RT）振动耦合中，尽管由于寿命展宽，c1s→平面外π*状态和c1s→平面内π*状态之间的RT分裂不是直接可见的。在CS2中，0°离子产率相对较小，但与CO2中的90°离子产率相当；在后者中，0°处的峰值比90°处的峰值低0.06 eV，各向异性参数β严重依赖于光子能量。在CO2中，大量未解析的弯曲振动是耦合的。π*峰较低能量侧半最大值处的半宽度对…
Fragment ions energetically emitted following the perpendicular (ΔΛ=+1) transitions of C 1s→π* of CS2, OCS, and CO2 are observed not only in the perpendicular (90°) direction but also in the parallel (0°) to the linear polarization; that is, ions have a momentum orthogonal to the linear molecule. This arises in the Renner–Teller (RT) vibronic coupling of bending vibrations in the C 1s→ in-plane π* excited state with a bent equilibrium geometry, though the RT splitting between the C 1s→ out-of-plane π* state with a linear geometry and the C 1s→ in-plane π* state is not visible directly due to the lifetime broadening. The 0° ion yield is relatively small in CS2 but is comparable to the 90° yield in CO2; in the latter the peak maximum at 0° is 0.06 eV lower than at 90° and the anisotropy parameter β is heavily dependent on the photon energy. In CO2 a great number of unresolved bending vibrations are coupled. The half-width at half-maximum on the lower energy side of the π* peak is much more sensitive to the ...