https://www.selleckchem.com/pr....oducts/LAQ824(NVP-LA
Nanoscale pattern formation on the surface of a solid that is bombarded with a broad ion beam is studied for angles of ion incidence, θ, just above the threshold angle for ripple formation, θ_c. We carry out a systematic expansion in powers of the small parameter ε≡(θ-θ_c)^1/2 and retain all terms up to a given order in ε. In the case of two diametrically opposed, obliquely incident beams, the equation of motion close to threshold and at sufficiently long times is rigorously shown to be a particular version of the anisotropic
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