Systematics of core line asymmetries in XPS spectra of Ni

Core line asymmetries have been observed in the 3p_{$\text{1}\text{2}$}, 3p_{$\text{3}\text{2}$}, 3s, 2p_{$\text{1}\text{2}$} and 2p_{$\text{3}\text{2}$} XPS spectra of Ni. The asymmetry parameters are the same for all lines within the experimental accuracy. The absence of exchange splitting in the 3s line indicates a 3d¹⁰ configuration for the fully screened final state of Ni.