Machine simulation of collisions between a copper atom and a copper lattice
Abstract
We have examined a number of collision events in which the target atom is embedded in a crystal
lattice. The fcc <100>, <110>, and <111> orientations were examined in detail for the energy
range from 25 eV to 10 keV. Preliminary results for the bcc <100> lattice are included. Lattice
effects are somewhat smaller than one might anticipate. Orientation effects are significant because
the relative atomic separations vary considerably between different orientations. The general
features of our results are insensitive to the form of interaction potential, but magnitudes vary
considerably. For the Gibson No. 2 parameters in a Born-Mayer potential, lattice effects lose
significance around 5-keV bombardment energy; for the Gibson No. 1 they persist to at least 10
keV. No "effective mass" behavior was detectable. Binary-collision theories are not valid for
energies below a few hundred eV.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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