Figure 1.

Schematic view of 50 keV Ar+ ion beam irradiation. For first stage (to prepare two deferent depth locations of a/c interface) at an angle of (a) 60° and (b) 0°, with respect to surface normal; second stage irradiation (for fabrication of ripples) at an angle of 60° named as (c) set A and (d) set B.

Kumar et al. Nanoscale Research Letters 2013 8:336   doi:10.1186/1556-276X-8-336
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