Collective excitations in liquid deuterium studied by inelastic neutron scattering

Well defined collective excitations up to a momentum transfer value of 3.8 Å -1 have been found in liquid deuterium 0.5 K above the melting point. The derived dispersion curve shows a remarkable similarity with the one observed for liquid 4He in the normal liquid phase, with a well defined minimum a...

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Bibliographic Details
Published in:Physics letters. A 1991-09, Vol.158 (5), p.253-257
Main Authors: Bermejo, F.J., Martinez, J.L., Martín-Marero, D., Mompean, F.J., García-Hernández, M., Chahid, A.
Format: Article
Language:English
Subjects:
Collective effects
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron states
Exact sciences and technology
Exchange, correlation, dielectric and magnetic functions, plasmons
Physics
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Summary:Well defined collective excitations up to a momentum transfer value of 3.8 Å -1 have been found in liquid deuterium 0.5 K above the melting point. The derived dispersion curve shows a remarkable similarity with the one observed for liquid 4He in the normal liquid phase, with a well defined minimum at a momentum transfer of 2.08 Å -1 corresponding to a gap of 30 K. A qualitative comparison is made with recent calculations on liquid para-hydrogen at the triple point.
ISSN:0375-9601
1873-2429
DOI:10.1016/0375-9601(91)91009-3