Vibrational predissociation in the bending levels of the à state of C3Ar
The Journal of Chemical Physics
Yi-Jen Wang and Yen-Chu Hsu
Vibrational predissociation in the bending levels of the à state of C3Ar
從16個碳三-氬凡德瓦爾分子的譜帶中觀察得振動初分解現象並可歸納出兩種形式。其中一種振動初分解現象-碳三碎片的振動能高且振動態符合|Δv| = 1, |ΔP| = 1的規則，P是碳三的電振角動量。另一種，碳三碎片的振動能低。振動初分解並不遵守軌域角動量守恆。所觀察的|ΔP|的規則可以偶極誘發偶極模型解釋。大部分的碎片振動態分布不符合間隙定理，我們認為這些振動初分解發生於臨界且涉及振動模的變動，這些現象未曾在間隙定理裡考慮過。
Vibrational predissociation (VP) has been observed in 16 。bands of the C3Ar van der Waals complex. Two types of VP processes have been recognized. The first type gives rise to vibrationally hot C3 fragments, mostly following |Δv| = 1, |ΔP| = 1 propensity rules, where P is the vibronic angular momentum of C3. The second type gives vibrationally cooled fragments. Although the initial states are associated with both orbital components of the C3 (Ã), most of the VP fragments belong to the lower orbital component. A dipole-induced dipole model has been used to interpret the observed ΔP- propensities. It is interesting that majority of the VP product distribution do not follow the gap law, we attributed it to the threshold predissociation and mode changing predissociation, which has not been considered in the model of gap law.