Figure 2.

AFM images for the 50 keV Ar+-irradiated set A and set B samples at an angle of 60°. At the fluences of 3 × 1017(a,e), 5 × 1017(b,f), 7 × 1017(c,g), and 9 × 1017 ions per square centimeter (d,h), respectively. The arrows in the figures indicate the projection of ion beam direction on the surface.

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