Abstract

Abstract The thickness of ice (H2O) layers accreted on a cold finger has been measured by detecting the interference pattern of a He-Ne laser beam (632.8 nm) reflected from the ice surface and from the underlying substrate. Sublimation and/or sputtering from the ice surface have been induced by bombarding the ice layers with 200 keV He+ ion beams. Sublimation rates and sputtering yields have been measured. It has been shown that if sublimation dominates then ice erosion is uniform and no light scattering is observed. If sputtering dominates, surface roughening, evidenced by light scattering, is observed.

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