Strong anisotropy in the inelastic neutron scattering from PdH at high energy transfer

The dynamics of stoichiometric palladium hydride have been investigated using high-resolution inelastic-neutron-scattering experiments at 25 K in the energy-transfer region 2--800 meV. Strong anisotropy of the high-energy part of the spectra was observed. These features, which are similar to those seen previously in {β}-V₂H, have energies remarkably close to the predictions of recent first-principles calculations.