Abstract
In previous conferences in this series we have discussed the development of surface topography resulting from ion bombardment induced sputtering erosion. A general approach, based upon wavefront evolution theory, has been used to predict the dynamic change in the topography of continuous surfaces and the conditions for discontinuity initiation (e.g. edges and points) determined. It had not been possible to predict the subsequent motion of such discontinuities but now we have, for the first time, been able to mathematically predict such trajectories by considering the dynamics of shock propagation. This new development is described and conditions for linear and curved edge trajectory motion are discussed. Comparison is made with both computer simulation of topography development and experimental studies of cone evolution.
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