Abstract
Effects on the limit of monolayer compression of large changes in the first layer adatom-substrate holding potential e0 and of uniaxial registry of the monolayer are discussed. It is shown that if the monolayer-to-bilayer transition occurs with only small changes in the nearest neighbour spacing, the chemical potential there depends on the second-layer binding, but little on e0. Consequences of the particularly large variations in e0 for helium between substrates are discussed. Model calculations of the limit of compression for uniaxially registered Xe/Cu(110) are reported; the chemical potential at the transition is quite close to that for condensation of bulk Xe. The value of e0 for Xe/Cu(110) and the experimental determination of the monolayer latent heat of adsorption are discussed and a revised value is proposed for the latent heat.
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