Computer simulation of multimers sputtered from copper.

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Author
Delapain, Calvin Bricker
Date
1975Advisor
Harrison, D. E. Jr.
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Show full item recordAbstract
The formation of clusters of sputtered atoms, called
multimers, has been investigated in a digital computer
simulation of single crystal copper bombarded with argon
ions. Five formation mechanisms for sputtered dimers and
four formation mechanisms for sputtered trimers were
identified and analyzed in detail. The mechanisms did not
reveal a single case in which a multimer was formed by the
motions of a single ion or atom. Multimers were found to
be caused by various interactions of the projectile ion
with atoms in the first four layers of the crystal.
Nearest neighbor atoms in the crystal rarely formed
dimers or trimers. Next nearest neighbor clustering was
much more common.
Members of a multimer usually were not emitted
simultaneously. Often four or five collisions by the ion
or its primary knock-on atoms would intervene between the
emission events, but the relatively slow speed of the
emitted atoms still allowed cluster formation.
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