Abstract

The phonon sideband observed in site-selected spectra for impurity centers in amorphous solids reflects density of states (DOS) of host modes. The low-frequency modes of amorphous solids have attracted much interest because of their peculiar character. Excitation of such modes results in the excess heat capacity compared with Debye solids at low temperatures around 10K. The excess contribution of DOS in amorphous solids has been also observed in the inelastic neutron scattering spectra in the corresponding energy region.

© 1994 Optical Society of America