Abstract
Adsorbing increasing amounts of methane (CH 4) at 80 K on graphite preplated with one monolayer of dichloromethane (CH 2Cl 2) results in a succession of transitions: partial displacement of the preadsorbed film and replacement by a CH 4 monolayer; incorporation of CH 4 in the remaining CH 2Cl 2 patches so as to form a 2D solution; alternate layer-by-layer condensation on the resulting dual surface. When CH 2Cl 2 preplating is in the submonolayer range, CH 4 monolayer condensation occurs first on the bare part of the surface. When the graphite surface is saturated with CH 2Cl 2 the displacement is suppressed.
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