Abstract
Monolayer solids of CH4, CD4, and CF4 adsorbed on the basal plane surface of graphite are modeled with atom–atom interaction models and quasiharmonic lattice dynamics. Single molecule adsorption, the stability of registry lattices at monolayer condensation, and the stability of triangular tripod-down lattices relative to a denser monolayer packing are treated. The Novaco–McTague perturbation theory of the modulation of an incommensurate monolayer by the substrate is extended to molecular adsorbates with orientational degrees of freedom. Experimental data for monolayers of tetrahedral molecules on graphite are summarized; the model calculations give a fair account of the data, with some discrepancies in the energies of monolayer condensation.
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