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Exact linear dispersion relation for the Sigmund model of ion sputtering

机译:离子溅射Sigmund模型的精确线性色散关系

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The exact linear dispersion relation is obtained for the Sigmund model, a model which forms the basis of nearly all theories of the nanoscale patterns produced by ion bombardment of solid surfaces. It is demonstrated that the amplitude of a surface disturbance of short wavelength grows exponentially in time, and so the Sigmund model is ill defined unless one or more smoothing terms are added to the equation of motion. It is also shown that effective surface diffusion [M. A. Makeev and A.-L. Barabasi, Appl. Phys. Lett. 71, 2801 (1997)] cannot be the only physical mechanism that smoothes the solid surface, even at low temperatures.
机译:可以为Sigmund模型获得精确的线性色散关系,该模型构成了几乎所有通过固体表面离子轰击产生的纳米级图案理论的基础。结果表明,短波表面扰动的幅度随时间呈指数增长,因此除非将一个或多个平滑项添加到运动方程中,否则Sigmund模型的定义不明确。还显示出有效的表面扩散[M。马克耶夫和A.-L.巴巴拉西,Appl。物理来吧71,2801(1997)]即使在低温下也不能是使固体表面光滑的唯一物理机制。

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