Vibrational spectrum of magnesium hydride

Abstract

The vibrational spectrum of hydrogen atoms in magnesium hydride has been studied by means of inelastic-neutron and Raman-scattering experiments between 12 and 295 K. After careful evaluation of multiple scattering and multiphonon contributions, we provide a vibrational frequency spectrum up to 180 meV and the mean-square displacement of hydrogen atoms. The inelastic light scattering spectra of (Formula presented) powders show three Raman allowed modes (Formula presented) and (Formula presented) and some smaller features that can be related with second-order and disorder-induced processes. © 2000 The American Physical Society.