High-energy neutron inelastic scattering from H2 in C28Cs(H2)1.52

Abstract

Neutron inelastic scattering from the intramolecular vibration of hydrogen at ≈516 meV (4162 cm-1) has been observed for the first time using the system C28Cs(H2)1.52 at 4 K. The data are consistent with an effective mass of the scattering particle of ≈1.33 amu which confirms the presence of H2 species. The extrapolated excitation energy at zero momentum transfer is, within experimental error, the same as the gas-phase value for H2, indicating little effect of the electronegative environment on the adsorbed hydrogen molecular force constant. Show more