Abstract
Spin-resolved inverse photoemission is employed to investigate crystal-induced and image-potential surface states on Ni(001). The observed value of the spin splitting for the crystal-induced state at X\ifmmode\bar\else\textasciimacron\fi{} is 180\ifmmode\pm\else\textpm\fi{}60 meV and there is experimental evidence of a nonvanishing exchange splitting of the image-potential state at \ensuremath{\Gamma}\ifmmode\bar\else\textasciimacron\fi{}. These data are consistently described within the framework of a multiple-reflection model for surface states if the upper band-gap boundaries are assumed to be exchange split by 200 meV at \ensuremath{\Gamma}\ifmmode\bar\else\textasciimacron\fi{} and 230 meV at X\ifmmode\bar\else\textasciimacron\fi{}. For \ensuremath{\Gamma}\ifmmode\bar\else\textasciimacron\fi{}, this splitting was confirmed experimentally by spin-resolved target-current spectroscopy.
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