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The physical origin of resonancelike peaks in the emission spectra of angle-resolved ultraviolet photoemission is analyzed. Emission from the $3d$ core level of Ni(001)-c(2×2) Se is studied. Evidence is found that the emission peaks exhibit strong dependence to the adsorbate-substrate geometry. Contrary to the gas-phase explanation in terms of the formation of a temporary "excited atom," we suggest that emission peaks from adsorbed species are due to constructive interference of the final-state electron wave between overlayer and substrate layers. Because of this strong dependence to the adsorbate-substrate spacing, it is recognized that the resonancelike peak can be used to determine surface bonding geometry.
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Li et al. (1979) studied this question.
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