Nonadiabatic transitions between lambda-doubling states in the capture of a diatomic molecule by an ion

被引:6
作者
Auzinsh, M. [1 ]
Dashevskaya, E. I. [2 ,3 ]
Litvin, I. [2 ,4 ]
Nikitin, E. E. [2 ,3 ]
Troe, J. [3 ,4 ]
机构
[1] Latvian State Univ, Dept Phys, LV-1586 Riga, Latvia
[2] Technion Israel Inst Technol, Schulich Fac Chem, IL-32000 Haifa, Israel
[3] Max Planck Inst Biophys Chem, D-37077 Gottingen, Germany
[4] Univ Gottingen, Inst Phys Chem, D-37077 Gottingen, Germany
关键词
D O I
10.1063/1.2913519
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The low-energy capture of a dipolar diatomic molecule in an adiabatically isolated electronic state with a good quantum number Omega (Hund's coupling case a) by an ion occurs adiabatically with respect to rotational transitions of the diatom. However, the capture dynamics may be nonadiabatic with respect to transitions between the pair of the Lambda-doubling states belonging to the same value of the intrinsic angular momentum j. In this work, nonadiabatic transition probabilities are calculated which define the Lambda-doubling j-specific capture rate coefficients. It is shown that the transition from linear to quadratic Stark effect in the ion-dipole interaction, which damps the T-1/2 divergence of the capture rate coefficient calculated with vanishing Lambda-doubling splitting, occurs in the adiabatic regime with respect to transitions between Lambda-doubling adiabatic channel potentials. This allows one to suggest simple analytical expressions for the rate coefficients in the temperature range which covers the region between the sudden and the adiabatic limits with respect to the Lambda-doubling states. (C) 2008 American Institute of Physics.
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页数:11
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