We present direct experimental evidence that adsorbate low-energy Auger transitions can be excited by secondary radiation from a substrate in a photoemission experiment. The system employed is P/Rh(111) and the P LVV intensity is shown to be dependent upon the flux of secondary radiation emitted from the Rh substrate. The implications of this result for surface x-ray standing-wave analysis using low-energy Auger peak intensities is discussed.
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Shard et al. (1998) studied this question.