[Zurück]

P. Szabo, C. Cupak, H. Biber, N. Jäggi, A. Galli, P. Wurz, F. Aumayr:
"Analytical model for the sputtering of rough surfaces";
Surfaces and Interfaces, 30 (2022), S. 10192401 - 10192411.

The sputtering yields of solids under ion bombardment are highly sensitive to the roughness of their surfaces. Understanding how sputtering is exactly affected by
different surface morphologies is relevant especially for plasma-wall interaction in fusion reactors and space weathering of planetary surfaces. We present an
analytical model that allows to calculate sputtering yields of random gaussian rough surfaces under arbitrary angles of incidence, taking into account local incidence
angles, shadowing and redeposition of sputtered materials. Sputtering yields of a rough surface can then be calculated with the sputtering yield´s dependence on the
ion incidence angle for a flat surface and a single statistical parameter, which characterizes the surface roughness. The model supports previous findings that the
mean surface inclination angle δm is a well-suited parameter to describe the sputtering behavior of rough surfaces. Comparisons of the results to previous experiments
and numerical simulations for various cases are presented, showing that the model allows to quantitatively reproduce sputtering yields of different samples over a
wide range of roughness regimes.

http://dx.doi.org/10.1016/j.surfin.2022.101924

https://publik.tuwien.ac.at/files/publik_303868.pdf