Density of states in solid deuterium: Inelastic neutron scattering study

A. Frei; E. Gutsmiedl; C. Morkel; A. R. Müller; S. Paul; M. Urban; H. Schober; S. Rols; T. Unruh; M. Hölzel

doi:10.1103/PhysRevB.80.064301

Density of states in solid deuterium: Inelastic neutron scattering study

A. Frei, E. Gutsmiedl, C. Morkel, A. R. Müller, S. Paul, M. Urban, H. Schober, S. Rols, T. Unruh, M. Hölzel

Chair of Physics I

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Abstract

The dynamics of solid deuterium (sD2) 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 sD2 the rotational transitions J=0 1 and J=12. The intensities of these rotational excitations depend strongly on the ortho- D2 molecule concentration co in sD2. 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.

Original language	English
Article number	064301
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	80
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.80.064301
State	Published - 6 Aug 2009

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title = "Density of states in solid deuterium: Inelastic neutron scattering study",

abstract = "The dynamics of solid deuterium (sD2) 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 sD2 the rotational transitions J=0 1 and J=12. The intensities of these rotational excitations depend strongly on the ortho- D2 molecule concentration co in sD2. 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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doi = "10.1103/PhysRevB.80.064301",

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T2 - Inelastic neutron scattering study

AU - Frei, A.

AU - Gutsmiedl, E.

AU - Morkel, C.

AU - Müller, A. R.

AU - Paul, S.

AU - Urban, M.

AU - Schober, H.

AU - Rols, S.

AU - Unruh, T.

AU - Hölzel, M.

PY - 2009/8/6

Y1 - 2009/8/6

N2 - The dynamics of solid deuterium (sD2) 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 sD2 the rotational transitions J=0 1 and J=12. The intensities of these rotational excitations depend strongly on the ortho- D2 molecule concentration co in sD2. 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.

AB - The dynamics of solid deuterium (sD2) 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 sD2 the rotational transitions J=0 1 and J=12. The intensities of these rotational excitations depend strongly on the ortho- D2 molecule concentration co in sD2. 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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VL - 80

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 6

M1 - 064301

ER -

Density of states in solid deuterium: Inelastic neutron scattering study

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