Density of states in solid deuterium: Inelastic neutron scattering study
Frei A, Gutsmiedl E, Morkel C, Müller AR, Paul S, Urban M, Schober H, Rols S, Unruh T, Hölzel M (2009)
Publication Status: Published
Publication Type: Journal article
Publication year: 2009
Journal
Publisher: AMER PHYSICAL SOC
Book Volume: 80
Journal Issue: 6
DOI: 10.1103/PhysRevB.80.064301
Abstract
The dynamics of solid deuterium (sD(2)) is studied by means of inelastic scattering (coherent and incoherent) of thermal and cold neutrons at different temperatures and para-ortho ratios. In this paper, the results for the generalized density of states (GDOS) are presented and discussed. The measurements were performed at the thermal neutron time-of-flight (TOF) instrument IN4 at ILL Grenoble and at the cold neutron TOF instrument TOFTOF at FRM II Garching. The GDOS comprises besides the hcp phonon excitations of the sD(2) the rotational transitions J=0&1 and J=1&2. The intensities of these rotational excitations depend strongly on the ortho-D(2) molecule concentration c(o) in sD(2). Above E=10 meV there are still strong excitations, which very likely may originate from higher-energy damped optical phonons and multiphonon contributions. A method for separating the one-phonon and multiphonon contributions to the density of states will be presented and discussed.
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APA:
Frei, A., Gutsmiedl, E., Morkel, C., Müller, A.R., Paul, S., Urban, M.,... Hölzel, M. (2009). Density of states in solid deuterium: Inelastic neutron scattering study. Physical Review B, 80(6). https://dx.doi.org/10.1103/PhysRevB.80.064301
MLA:
Frei, Andreas, et al. "Density of states in solid deuterium: Inelastic neutron scattering study." Physical Review B 80.6 (2009).
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