Disorder Effects and Resonant Features in Raman Spectra of Electron-Irradiated GaP and CdS Crystals

Abstract

Electron-irradiated (by 7-14 MeV electrons) GaP and CdS crystals and CdS-based solid solutions were studied by Raman scattering. Disorder-activated acoustic phonon bands are revealed in the GaP spectrum with increase of the irradiation dose. Broadening of the TO-phonon band in irradiated GaP samples is observed. The behaviour of the LO-and 2LO-phonon resonant Raman scattering versus irradiation dose is discussed, the resonant conditions being tuned by variation of exciting light energy and crystal composition.