Sputtering of chemisorbed nitrogen from the (100)--planes of tungsten and molybdenum: a comparison of computer simulation and experimental results.

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Author
Mattson, Philip Jay
Date
1986-12Advisor
Harrison, Don E. Jr.
Second Reader
Woehler, Karlheinz E.
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Show full item recordAbstract
The Naval Postgraduate School simulation model, QDYN86, was used to
examine sputtering of nitrogen from the (100) faces of single crystals
of molybdenum and tungsten. The nitrogen placement was varied, and
analyses were conducted on the sputtering cross sections of the
nitrogen. The cases where the a da torn was directly hit by the incident
ion, or if it was sputtered due to the collision cascade process, were
analyzed separately. The simulations were conducted to compare the
results with Winters' recent work, and to build upon the efforts of earlier
studies completed at the Naval Postgraduate School. It was found
that placement of nitrogen at 0.245 A from the surface of molybdenum
resulted in cross sections similar to those found by Winters. The
effect of the mass of the substrate was verified, in that a substrate of
greater mass results in a higher sputtering cross section. This agreed
with Winters' findings, and conflicted with earlier conclusions of past
theses. The adatoms apparently reduce the momentum available to create
collision cascades, reducing the sputter yield ratio of the substrate
when the ions directly hit the adatoms.
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