Abstract
Fast ions erode films of molecular and rare gas solids as a result of electronic energy loss of the incident particles. The dependence of the low temperature erosion yield on electronic stopping power is nonlinear and approximately quadratic for light ions. Thermal spike and Coulomb repulsion models for erosion in this temperature regime are discussed. Measurements of ejected species from D 2O ice eroded by MeV He + ions show a constant and dominant yield of D 2O molecules below 135 K and a monotonically increasing yield of D 2 and O 2 molecules from 55 to 150 K. The new molecules must result from rearrangement of fragments produced in the film by ionization. The temperature dependence is believed to be due to diffusion controlled migration in the film.
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