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Abstract: The dynamics of solid deuterium sD2 is studied by means of inelasticscattering coherent and incoherent of thermal and cold neutrons at differenttemperatures and para-ortho ratios. In this paper, the results for thegeneralized density of states GDOS are presented and discussed. Themeasurements were performed at the thermal neutron time-of-flight TOFinstrument IN4 at ILL Grenoble and at the cold neutron TOF instrument TOFTOF atFRM II Garching. The GDOS comprises besides the hcp phonon excitations of thesD2 the rotational transitions J = 0 ->1 and J = 1 -> 2. The intensities ofthese rotational excitations depend strongly on the ortho-D2 moleculeconcentration co in sD2. Above E = 10 meV there are still strong excitations,which very likely may originate from higher energy damped optical phonons andmulti-phonon contributions. A method for separating the one- and multi-phonononcontributions to the density of states willbe presented and discussed.



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

Fuente: https://arxiv.org/







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