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Spin-orbit coupling, exchange interaction, and hybridization in the photoexcitation of the Ni 3p core level.

A spin-polarized photoemission study of the Ni 3{ital p} core level reveals the spin polarization of the main line and the satellites. A detailed comparison with calculation confirms earlier assignments that the satellites have {ital d}{sup 9} character. However, the measurement also reveals the role of spin-orbit and exchange interactions in determining the spin polarization of the main peak, which is shown to be composed of both {ital d}{sup 9} and {ital d}{sup 10} character. The study shows that the spin polarization in the leading edge of the main line reflects its {ital d}{sup 9} character as a result of the hybridization between the different configurations.