Mechanisms of pattern formation in grazing-incidence ion bombardment of Pt(111)
作者： Henri Hansen , Alex Redinger , Sebastian Messlinger , Georgiana Stoian , Yudi Rosandi
DOI: 10.1103/PHYSREVB.73.235414
关键词: Pattern formation 、 Molecular physics 、 Atomic physics 、 Lattice (order) 、 Atomic units 、 Scanning tunneling microscope 、 Molecular dynamics 、 Atmospheric temperature range 、 Materials science 、 Ion 、 Ripple
摘要: Ripple patterns forming on Pt(111) due to 5 keV Ar{sup +} grazing-incidence ion bombardment were investigated by scanning tunneling microscopy in a broad temperature range from 100 720 K and for fluences up 3x10{sup 20} ions/m{sup 2}. A detailed morphological analysis together with molecular dynamics simulations of single impacts allow us develop atomic scale models the formation these patterns. The large difference step edge versus terrace damage is shown be crucial ripple under grazing incidence. importance distinct diffusion processes--step adatom generation at kinks lattice gas formation--for dependent transitions surface morphology highlighted. Surprisingly, effects like thermal spike induced production planar subsurface channeling are important pattern ordering.
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