Phase Diagram of Physisorbed Argon Monolayer on Graphite

다국어 초록 (Multilingual Abstract)

Studies on adsorption isotherms with sharp step-wised layer condensation help us better understanding
on two-dimensional systems. We have presented vapor-pressure adsorption isotherm
studies of argon films on highly oriented pyrolytic graphite in the monolayer region, by using a
phase-modulated ellipsometric technique. The successive gas-liquid-solid phase transition observed
during build up of a monolayer in Kr/graphite and Xe/graphite isotherms is not observed in any
argon monolayer isotherms. The critical temperature, determined from the width in the chemical
potential of the layer condensation step, is about 55.6 K, which is close to Migone’s capacity result.
However if the background, known to come from the inhomogeneous nature of the graphite substrate,
is considered, it is about 58 K. From our work and Migone’s heat-capacity results, we were
able to complete a phase diagram of argon on graphite in the monolayer region. <

참고문헌 (Reference)

1 "inPhase Transition in Surface Films 2" Plenum 357-, 1991