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The role of nonlinear lattice excitations in sputtering

The ejection of atoms from a crystal by inelastic scattering of quodons, a type of nonlinear lattice excitation, after propagating > 10 7 atoms in chain directions, has relevance to sputtering. Here we report on the propagation of quodons in dieren t chain directions with dieren t atomic spacing. Simulations are given of quodon creation under various conditions, their reection at a surface and of the ejection process. The relationship between quodons and discrete breathers is considered. Possible applications and predictions are discussed.