title: Mobility transition of solid rare gases in confined environments.
abstract: We report the results of x-ray diffraction and small angle scattering studies of Ar and Kr confined in sol-gel and Vycor glasses. The confined liquid crystallizes in a disordered hcp structure on freezing. Upon further cooling a sharp transition occurs at a reduced temperature of T/T(m) approximately 0.65, where the crystalline structure disappears and the total scattering decreases. This behavior marks the onset of a well-defined mobility transition, where the confined sample migrates out of the pore space.
authors.affiliation: Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
authors.forename: D E
authors.initials: DE
authors.lastname: Silva
authors.forename: P E
authors.initials: PE
authors.lastname: Sokol
authors.forename: S N
authors.initials: SN
authors.lastname: Ehrlich