Two stages of motion of anharmonic oscillators modeling fast particles in crystals |
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Authors: | Yu A Kashlev |
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Institution: | 1.Baikov Institute for Metallurgy and Material Science,RAS,Moscow,Russia |
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Abstract: | We consider the evolution of the spatial distribution of fast atomic particles as they pass through a crystal. At small penetration
depths where the particles move without significant loss of coherence, the joint probability density function becomes smoother
at the expense of the gradient of the anharmonic potential of the planar channel. We show that as a result of this smoothing,
there arises a quasiequilibrium (quasistationary) state of the subsystem of fast particles. The further evolution of the particle
distribution is caused by nonelastic scattering and is described by the kinetic equation. At this stage, the anharmonic character
of particle oscillations between the channel walls results in a renormalization of the total phonon scattering cross section
of particles, and the renormalization is determined by the fourth-order anharmonic interaction. |
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