Abstract
The integrated areas of the Al L 23VV and O KL 23L 23 Auger peaks and the Al surface plasmon energy ħω S are reported for the Al(001) surface as a function of exposure to O in the exposure range 0–114 L(1 L=1langmuir=10 −6Torr sec). It is shown that for exposures below a critical value of 15 L, ħω S is constant within experimental error while the O Auger peak area increases linearly. For exposures above 15 L, ħω S decreases linearly from 10.5 eV to 8.5 eV and the O Auger peak area undergoes relatively slow linear increases correspondingly. The Al Auger peak area decreases by 30% per 1 eV decrease of ħω S. The results are discussed with reference to theory relating Auger transition intensities to the spectral density function.
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