Abstract
Materials physisorbed on a graphite single-crystal produce LEED diffraction patterns which reveal that ordered structures are common in the monolayer range under the accessible p, T conditions. Properties related to structure are emphasized. Where lateral interactions are weak (Xe, Br2, Cs, Cs, C6H3Br3, GeI4) the crystal phase (or phases) appears only at high coverage. Where lateral forces are stronger (As2O3, FeCl3, ZnI2 and GeI2 with ionic bonding in the layer) clustering to form a crystal phase occurs at much lower coverage. Examples are given of gas and liquid phases, uniaxial epitaxy and coincidence structures, recrystallization phenomena, displacement reactions, electron desorption, structure limited monolayer capacity, correlation with work function and order-disorder phenomena.
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