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 MgH₂ powders show three Raman allowed modes (A1g, B1g, and Eg) and some smaller features that can be related with second-order and disorder-induced processes.
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Santisteban et al. (2000) studied this question.
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