Neutron-Diffraction Study of Phases of CD4Monolayer Films on Graphite

Abstract
Neutron-diffraction studies have been carried out of the various two-dimensional phases of CD4 physisorbed on graphite and a phase diagram has been constructed. Registered, expanded, and compressed solid phases and a disordered fluidlike phase have been identified. The lattice constant, intensity, and cluster size have been measured as functions of temperature and coverage and the nature of the transitions between the phases has been investigated.