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Application of adiabatic theory of vibrational predissociation to T-shaped triatomic van der Waals' molecules |
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| Affiliation: | 1. Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China;2. Research Institute of Superconductor Electronics, Nanjing University, Nanjing, Jiangsu 210023, China;3. State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry Chinese Academy of Sciences, Beijing 100080, China;1. School of Physics and Materials Science, Nanchang University, Xuefu Avenue 999, Nanchang City 330031, China;2. Institute of Space Science and Technology, Nanchang University, Xuefu Avenue 999, Nanchang City 330031, China |
| Abstract: | An expression for the rate constant of the vibrational predissociation (VPD) of T-shaped triatomic van der Waals' (vdW) molecules is derived on the basis of the adiabatic separation between the high-frequency intramolecular and low-frequency vdW modes. The intramolecular and vdW modes are assumed to be characterized by the Morse-type interaction potentials. The dependence of the VPD line width on the intramolecular vibrational quantum number of a T-Shaped I2-He vdW molecule is calculated by using the expression derived. The magnitudes of the calculated VPD line width are of the same order as those of the experimental. It is shown that the Condon approximation is insufficient and the non-Condon treatment is necessary to evaluate quantitatively the VPD rate constant within the adiabatic theory. |
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