Abstract
The (0001) crystal face of Bi and its reaction with oxygen have been studied using LEED, Auger electron spectroscopy, and electron loss measurements. Loss spectra from the clean surface included two peaks from the 5d levels, a 14-eV bulk plasmon loss, and a 6.5-eV loss which like that from a surface plasmon became more pronounced with decrease in incident electron energy. Room-temperature exposure to 104 L of oxygen was necessary before the onset of appreciable chemisorption and the development of overlayer diffraction features. For the oxidized condition, the 5d loss peaks were seen to shift away from the elastic peak while the 6.5-eV loss was replaced by one at 9.3 eV.
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