Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1682497 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms | 2013 | 4 Pages |
Abstract
Using molecular-dynamics simulation we calculate the crater function - i.e., the surface height profile averaged over many ion impacts on a virgin surface - for the case of a single-crystalline surface. The special case of 500Â eV Ar impact into a Cu surface is considered, and 3 different surface orientations - (1Â 0Â 0), (1Â 1Â 0) and (1Â 1Â 1) - are calculated. We find that the crater function reflects the anisotropy of the surface. In particular, the crater rim follows the adatom angular emission distribution; its symmetry corresponds to the well-known angular distribution of sputtered atoms, the so-called Wehner spots. Erosive (sputtering) and relocative (adatom formation) contributions to the crater pit follow the energetics of the necessary bond breaks and are in a ratio of â¼1:2.5.
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
Cemal Engin, Herbert M. Urbassek,