Figure 1.

Ion bombardment of a sinusoidal wave geometry. Ion flux density, J, incident at an angle θ with respect to mean surface plane is shown. Local surface gradient, tan <a onClick="popup('','MathML',630,470);return false;" target="_blank" href="">View MathML</a>. Sinusoidal wave is described by h = h0 sin(2πx/λ), where λ is the wavelength of the ripples, and h0 is the amplitude.

Basu et al. Nanoscale Research Letters 2013 8:289   doi:10.1186/1556-276X-8-289
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