Accession Number : ADA140900

Title :   Computer Simulation Studies of Sputtering from Clean Tungsten and Nitrogen Reacted Tungsten and Molybdenum Surfaces.

Descriptive Note : Master's thesis,


Personal Author(s) : Meyerhoff,D

PDF Url : ADA140900

Report Date : Dec 1983

Pagination or Media Count : 85

Abstract : The Naval Postgraduate School computer simulation model QRAD was used to study sputtering from clean and nitrogen reacted tungsten, and from nitrogen reacted molybdenum, for (001) surfaces bombarded by normal incidence argon ions in the energy range from 0.5 keV to 3.0 keV. The simulation results are compared to experimental data obtained by Winters, who concludes, that the difference in the cross sections for the sputtering of nitrogen from W(001) and Mo(001) is dominated by the adsorbate-substrate mass difference since the other important parameters are similar. The simulation however shows little dependence on the substrate mass, but a strong dependence of the sputtering cross sections on the distance of the adatoms above the substrate. The nitrogen position is required to be higher on tungsten than on molybdenum. (Author)

Descriptors :   *Surface chemistry, *Nitrogen, *Computerized simulation, *Molybdenum, *Tungsten, *Surface properties, *Ion bombardment, Substrates, Sputtering, Surface active substances, Absorbers(Materials), Cross sections, Crystal lattices, Argon, Energy transfer, Theses

Subject Categories : Metallurgy and Metallography
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE