High Resolution Electron Energy Loss Studies of Chemisorbed Species on Aluminum and Titanium.
Final rept. 1 Apr 80-31 Mar 83,
TEXAS UNIV AT AUSTIN DEPT OF PHYSICS
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This report summarizes significant accomplishments and research progress achieved during the last three years under grant AFOSR-80-0154. The overall project objective was to apply high-resolution electron-loss-spectroscopy to the study of chemisorbed species on aluminum and titanium surfaces. Pursuant to this objective, a suitable spectrometer was constructed which incorporates the necessary sample preparation and characterization capabilities including low energy electron diffraction and Auger electron spectroscopy in addition to a state-of-the-art electron energy loss spectrometer. This instrument has been used to study several chemisorbed systems including oxygen on aluminum, oxygen on nickel and hydrogen on tungsten. The primary scientific results of this program to date have been published and have been described in the four interim reports to AFOSR. Significant results include electron energy loss studies of oxygen on aluminum which establish the simultaneous formation of overlayer and underlayer oxygen during initial oxidation, demonstration of the applicability of lattice-dynamical modeling to interpretation of energy loss data in order to test structural models, and observation of the first azimuthal pattern for impact scattering in electron energy loss studies of hydrogen on tungsten.
- Inorganic Chemistry
- Atomic and Molecular Physics and Spectroscopy