Date of Award
2015
Degree Type
Thesis
Degree Name
Master of Science in Physics
Department
Physics
First Advisor
David R. Heskett
Abstract
The goal of this thesis is to study the behavior of ion-induced defects at the Y point on the Ni (110) surface at elevated temperatures. The electronic structure of the surface is examined using inverse photoemission spectroscopy (IPES), and the geometric structure is observed using low energy electron diffraction (LEED). These measurements lead to a better understanding of the surface properties.
The clean Ni (110) surface exhibits a peak ~ 2.6 eV above the Fermi level, indicating an unoccupied surface state near the Y point of the surface Brillouin zone (SBZ). Defects are induced by low energy ion bombardment at various temperatures, which result in a decrease of the peak intensity. The surface state eventually disappears when bombarded for longer times. We also observed that the surface heals faster when the crystal is being simultaneously sputtered and annealed at higher versus lower temperature. Finally the data for annealing while sputtering versus annealing after sputtering does not seem to exhibit much difference.
Recommended Citation
Peddinti, Vijay Kumar, "ION-BOMBARDMENT OF NICKEL (110) AT ELEVATED TEMPERATURE" (2015). Open Access Master's Theses. Paper 550.
https://digitalcommons.uri.edu/theses/550
Terms of Use
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