ANHARMONIC DECAY OF VIBRATIONAL-STATES IN AMORPHOUS-SILICON

Anharmonic decay rates are calculated for a realistic atomic model of amorphous silicon. The results show that the vibrational states decay on picosecond time scales and their decay rates increase with increasi ng frequency. These results disagree with a recent experiment. In cont rast to predictions of the fracton model, we find no evidence that the anharmonic decay is inhibited in the region of localized states.