Raman scattering by surface vibrations of germanium crystals
Gaisler V. A. , Neizvestnyi I. G. , Sinyukov M. P. , Talochkin A. B.
An additional line which has been discovered in the spectrum of the Raman scattering of light by optical phonons in germanium stems from a vibration that is localized near the surface of the crystal. The reasons for the appearance of a vibration of this type are analyzed on the basis of an anharmonicity of optical vibrations. Relaxation of atomic layers near the surface is taken into account.