Abstract
The influence of fuzz-like tungsten surface structures on the shape of helium energy spectra recoiled by an incident 10 MeV 16O beam was investigated by computer simulations using the program STRUCTNRA and a phenomenological two-dimensional tungsten fuzz model. The model describes fuzz by a random distribution of inclined rectangular filaments containing tungsten and 1 at% helium. The mean width of the filaments was varied from 10 to 100 nm and the mean filament height was varied from 10 to 1500 nm while keeping the total amount of material constant. The shapes of the helium recoil energy spectra are modified by the fuzz, the deviations from the spectrum of a smooth sample increase with increasing filament widths and heights. The total numbers of detected helium recoils remain surprisingly independent of the filament widths and heights. A surrogate smooth sample with depth profile yielding a recoil energy spectrum identical to a fuzzy sample can be always found. The total amount of He can be derived robustly using the surrogate sample.
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