The Rate of Fast Particles Leaving a Planar Channeled Regime in a Quasiclassical Approach

摘要

The rate of particles leaving a planar channeling regime is studied in the framework of nonequilib-rium statistical theory. In the quasiclassical case, an analytical expression for the corresponding kinetic coefficient R_N~((dec)) is obtained for high-energy particles interacting with valence electrons. At high temperatures, the expression for particle transition is found to agree reasonably well with the probability of thermal (nonra- diating) transition of particles from channeling. The rate coefficient R_N~((dec)) including terms of the lowest order with respect to the particle-electron interaction is inversely proportional to vibrational energy relaxation time τ_v, while the anharmonicity of particle vibration in a planar channel has an effect on the relaxation process only because of its interference with the electron scattering.