Abstract
Two-dimensional phase transitions in monolayers of Kr and Xe adsorbed on the (110) face of Cu were studied. As the external gas pressure is raised, a compression of adatoms along the close packed rows is observed. For Xe, first a c(2 × 2) commensurate structure is formed by a continuous transition, then a gradual compression gives rise to a commensurate-incommensurate phase transition, for which the misfit variation is consistent with recent theoretical models. On the other hand, for Kr a first order gas-solid transition is found, followed by a slight compression giving rise to a c(2 × 8) superstructure. A discussion of the results and a comparison between Xe and Kr is presented.
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