Density of states in solid deuterium: Inelastic neutron scattering study

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autor(en): Frei A, Gutsmiedl E, Morkel C, Müller AR, Paul S, Urban M, Schober H, Rols S, Unruh T, Hölzel M
Zeitschrift: Physical Review B
Verlag: AMER PHYSICAL SOC
Jahr der Veröffentlichung: 2009
Band: 80
Heftnummer: 6
ISSN: 1098-0121


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.



FAU-Autoren / FAU-Herausgeber

Unruh, Tobias Prof. Dr.
Professur für Nanomaterialcharakterisierung (Streumethoden)


Autor(en) der externen Einrichtung(en)
Institute Laue-Langevin (ILL)
Technische Universität München (TUM)


Zitierweisen

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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