Adsorption and Growth Studies of CF$_{4}$ on CF$_{3}$Cl - Covered HOPG

We have studied the adsorption and growth of CF$_{4}$ on a CF$_{3}$Cl-covered graphite surface from 60 K to 105 K, using infrared reflection absorption spectroscopy (IRAS) supplemented by ellipsometry. For the monolayer liquid phase of CF$_{3}$Cl, the CF$_{4}$ initially mixes/dissolves in the CF$_{3}$Cl layer and then continuously replaces the CF$_{3}$Cl on the surface. However, there remains a trace of CF$_{3}$Cl even after a number of layers of CF$_{4}$ are deposited on the surface. The orientation of the residual CF$_{3}$Cl is different from the orientation of the original CF$_{3}$Cl monolayer. For the monolayer solid phases of CF$_{3}$Cl, the CF$_{4}$ adsorbs on top of the CF$_{3}$Cl layer, with little or no solubility. With two layers of CF$_{3}$Cl on the graphite, CF$_{4}$ displaces one of the layers and adsorbs on top of the remaining layer.