Abstract
The transverse phonon at the zone boundary has been studied in the commensurate(C)-phase of D2 adsorbed on graphite with inelastic neutron scattering. This excitation looses intensity and shows a measurable lifetime in the higher density striped domain wall phase adjacent to the C-phase. In addition an excitation at lower energy appears. These modes resist also above 7K in the reentrant liquid phase showing that this phase is in reality a solid phase with domain walls which possess however only short range order as can be concluded from elastic neutron scattering studies.
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