Nonexponential temperature dependence of the rate of threshold inelastic processes in dense media |
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Authors: | N L Aleksandrov A N Starostin |
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Institution: | (1) Moscow Physicotechnical Institute, 141700 Dolgoprudnyi, Moscow Region, Russia |
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Abstract: | The influence of the density of the medium on the temperature dependence of the rate constants of inelastic processes is investigated.
It is shown that besides the effects like lowering of the ionization potential, which accelerate excitation and ionization
processes in a nonideal plasma, there is a stronger mechanism for such acceleration, which is associated with the high frequency
of collisions between particles and leads to destruction of the one-to-one relation between the energy and momentum of the
particles in a dense medium. It is manifested by the presence of power-law tails in the equilibrium momentum distribution
of the particles, which leads to a nonexponential temperature dependence of the rates of inelastic reactions in dense gases
and nonideal plasmas. A kinetic equation for the generalized energy and momentum distribution function of electrons in an
external electric field, which permits investigation of the effect under consideration under nonequilibrium conditions, is
presented.
Zh. éksp. Teor. Fiz. 113, 1661–1674 (May 1998) |
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