Hydrogen vibrations in CdS

Abstract

The study of localized vibrational modes of hydrogen and deuterium in proton- and deuterium-implanted cadmium sulfide is reported. The observed SH and SD vibrations have energies of 2240 and 1775 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$, respectively. A possible CdH vibration is observed at 1285 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$, but the corresponding CdD mode falls in the region of multiphonon absorption and cannot be detected. The measured oscillator strengths for SH and SD modes are comparable with those reported for nonmetal hydrides in other II-VI compounds, whereas the integrated intensity of the CdH mode is smaller than for metal hydrides in other covalent semiconductors. This is probably because of weak CdH bonding and subsequent partial hydrogen release during bombardment or due to interaction with lattice phonons.