Abstract
We propose a hard sphere model of bimolecular recombination RM+ + X– → MX + R, where M+ is an alkali ion, X– is a halide ion, and R is a neutral rare gas or mercury atom. Calculations are carried out for M+ = Cs+, X– = Br–, R = Ar, Kr, Xe, Hg, for collision energies in the range from 1 to 10 eV, and for distributions of the RM+ complex internal energy corresponding to temperatures of 500, 1000, and 2000 K. The excitation functions and opacity functions of bimolecular recombination in the hard sphere approximation are found, and the classification of the collisions according to the sequences of pairwise encounters of the particles is considered. In more than half of all the cases, recombination occurs due to a single impact of the Br– ion with the R atom. For the recombination XeCs+ + Br–, the hard sphere model enables one to reproduce the most important characteristics of the collision energy dependence of the recombination probability obtained within the framework of quasiclassical trajectory calculations.
Highlights
Reactions of ionic dissociation of molecules and reverse reactions of recombination of ions constitute an important component of many complex chemical processes occurring in various non-equilibrium natural or technological media
There is a rich body of literature devoted to investigations of the dynamics of ionic dissociation of alkali halide molecules in collisions with rare gas and mercury atoms in crossed molecular beams, see the surveys [3,4,5,6,7] and the detailed bibliography [8]
The calculations show that the dynamics of recombination (6) in our model is weakly dependent on the temperature T
Summary
Reactions of ionic dissociation of molecules and reverse reactions of recombination of ions constitute an important component of many complex chemical processes occurring in various non-equilibrium natural or technological media. There is a rich body of literature devoted to investigations of the dynamics of ionic dissociation of alkali halide molecules (first of all, of cesium halides) in collisions with rare gas and mercury atoms (as well as with a sulfur hexafluoride molecule) in crossed molecular beams, see the surveys [3,4,5,6,7] and the detailed bibliography [8]. These CID reactions proceed according to the schemes
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