Evaluation of the rate constants of dissociative and ternary recombination reactions of argon ions on the basis of the results of ballistic experiments |
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Authors: | N N Pilyugin |
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Institution: | (1) Scientific-Research Institute of Mechanics, M. V. Lomonosov Moscow State University, 119899 Moscow, Russia |
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Abstract: | AbstractExperimental data on the change in the electron density in the wake of a ballistic object traveling at velocities
V
∞=3.4–4.9 km/s in argon at pressures p
∞=30–100 Torr are processed and analyzed. A reaction scheme is proposed which takes into account the recombination of charged
particles, processes of ionic conversion, and the excited states of the atom. The solution of the equations of a nonequilibrium
boundary layer for flow in the wake is used to formulate the inverse problem of determining the rate constants for dissociative
recombination Ar
2
+
+e→Ar+Ar and ternary recombination Ar++e+Ar→Ar+Ar. The “nearest-neighbor” approximation is used to obtain theoretically an expression for the ternary recombination
coefficient as a function of temperature and pressure. Numerous solutions of inverse problems and a comparison with experiments
demonstrates the validity of the expression obtained for the ternary recombination coefficient. It is shown that this expression
is valid for moderate pressures and complements the Pitaevskii result for low pressures and the Langevin result for high pressures.
Zh. Tekh. Fiz. 67, 12–18 (May 1997) |
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Keywords: | |
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