Browsing by Author "Bulgadaev, S. A."

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    Elementare Anregungen und kombinierte Streuung in einem System nicht im Gleichgewicht befindlicher Phononen
    (1975) Bulgadaev, S. A.; Levinson, I. B.; Pertschi, Ottmar (Übersetzer)
    Renormalisation of the long-wave optical phonon spectrum due to the strongly nonequilibrium quasimonochromatic distribution of acoustic phonons with a frequency equal to half that of the optical phonon is studied. It is shown that in such systems of acoustic phonons long-lived long-wave excitations are presen whose frequency is close to that of the optical phonon. These elemmentary excitations are manifest in the light combinational scattering spectrum and lead to a complex structure of the Stokes scattering line.