Model for Kinetic Electron Ejection from Gas-Covered Surfaces

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Abstract
A model for the ionization of molecules adsorbed to a surface by energetic ion bombardment is described. The transition of a hypothetical "average" ion to the surface through a low-density surface gas is analyzed and assumed to represent the ensemble of collision processes encountered in the real case. This leads to the determination of the probability of freeing an electron from an atom in the surface gas by an impinging ion. For surfaces with a monolayer or more of adsorbate, the probability is comparable in size to coefficients of potential and kinetic ejection for ion kinetic energies above 1000 eV.

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