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 ${\mathrm{MgH}}_{2}$ powders show three Raman allowed modes ${(A}_{1g},$ ${B}_{1g},$ and ${E}_{g})$ and some smaller features that can be related with second-order and disorder-induced processes.
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