Vibrational spectrum of magnesium hydride

J. R. Santisteban; G. J. Cuello; J. Dawidowski; A. Fainstein; H. A. Peretti; A. Ivanov; F. J. Bermejo

doi:10.1103/PhysRevB.62.37

Vibrational spectrum of magnesium hydride

J. R. Santisteban, G. J. Cuello, J. Dawidowski, A. Fainstein, H. A. Peretti, A. Ivanov, and F. J. Bermejo

Phys. Rev. B 62, 37 – Published 1 July 2000

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