Inelastic neutron scattering from solid molecular hydrogen at various densities

• Published in: Chemical physics Vol. 427; pp. 101 - 105
• Main Authors: Colognesi, Daniele, Celli, Milva, Zoppi, Marco
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 12.12.2013
• Subjects: Density of phonon states; Grueneisen model; Incoherent inelastic neutron scattering; Solid para-hydrogen; Density of phonon states; Solid para-hydrogen; Incoherent inelastic neutron scattering; Grueneisen model
• ISSN: 0301-0104
• DOI: 10.1016/j.chemphys.2013.03.022

[Display omitted] •We measured inelastic neutron spectra from solid H2 at 19.3K at various pressures.•We used the crystal-analyzer inverse-geometry spectrometer TOSCA-I at ISIS.•We extracted densities of phonon states and studied their density-induced changes.•These data improve the existing scenario concerning both statistics and accuracy. We have measured the inelastic neutron scattering spectra of solid para-hydrogen at T=19.3K as a function of the sample pressure up to 636bar, using the crystal-analyzer inverse-geometry spectrometer TOSCA-I (ISIS, Rutherford Appleton Laboratory, UK). From the experimental spectra we have extracted the densities of phonon states and studied their evolution along with the sample density. Results have been compared with the estimates available in the literature. The present determinations improve substantially the previous experimental scenario from the point of view of both statistics and accuracy.