Regensburg 2013 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 6: Focus Session: Ion Beam Induced Surface Patterns II

DS 6.1: Vortrag

Montag, 11. März 2013, 14:45–15:00, H8

Surface instability due to ion induced atomic mass transport - the CV model revisited — •Hans Hofsäss — II. Physikalisches Institut, Universität Göttingen

In this work the deterministic defining equations for the height evolution dh(x,y,t)/dt of a surface, originating from atomic mass redistribution parallel to the surface caused by ballistic displacements, are derived. The calculations follow the description of Carter and Vishnyakov [1] and Davidovitch et al. [2] but take into account important additional contributions to the height evolution not considered so far. Moreover, Monte Carlo simulations using SDTrimSP V5.05 [3] are used to derive ion incidence angle dependent quantities, like the recoil depth distribution and the lateral mean distance of atomic mass transport, from the calculated 3-dimensional recoil distributions. In this way simplified approximations of an angle dependence using a sine or cosine behaviour can be avoided. It will be shown that the transition from stability to instability in x-direction (parallel to the projected beam direction) is no longer fixed at 45^∘. Moreover, it will be shown, that in contrast to the conclusion in [2], ion-induced mass redistribution gives no contribution to stability or instability in y-direction.
G. Carter, V. Vishnyakov, Phys. Rev. B 54, 17647 (1996).
B. Davidovitch, MK. J. Aziz, M.P. Brenner, Phys. Rev. B 76, 205420 (2007).
W. Eckstein, R. Dohmen, A. Mutzke, R. Schneider, MPI for Plasma Physics, IPP Report 12/3 (2007).