INELASTIC NEUTRON-SCATTERING STUDY OF THE GLASS FORMER ZNCL2

Triple-axis neutron scattering measurements on ZnCl2 glass are describ ed. The inelastic scattering S(Q,omega) for constant Q scans shows a p ronounced low-frequency excitation feature in the region 0.2 to 0.7 TH z in the glassy and supercooled liquid states, which can be identified with the boson peak that has been observed in other systems. Detailed results show that this feature has the temperature dependence of harm onic vibrations, in particular its frequency is independent of the tem perature. Further it shows no dispersion in Q, and the intensity is st rongly correlated with the static structure factor S(Q).