Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
1998-12-16
Physics
Condensed Matter
Soft Condensed Matter
submitted to Europhys.Lett
Scientific paper
10.1209/epl/i1999-00180-y
A nonperturbative theory of multiphonon anharmonic transitions between energy levels of a local mode is presented. It is shown that the rate of transitions rearranges near the critical level number $n_{cr}$: at smaller $n$ the process slows down, while at larger $n$ it accelerates in time, causing a jump-like loss of energy followed by the generation of phonon bursts. Depending on parameters, phonons are emitted in pairs, triplets etc.
Hizhnyakov Vladimir
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