Abstract

The influence of flux on the growth of ripples on Si(111) under bombardment of oblique, 1 keV O2+ beams was investigated. We found that a low flux leads to a significantly higher ripple growth rate per ion than a high flux. This effect is attributed to a reduction in the viscous flow of the amorphized material. At low fluxes, the viscous flow is reduced because there is more thermal annealing of the radiation damage. Current models of surface roughening remain valid if the flux dependence of the viscous flow is taken into account.

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