  In this paper, high Fe-concentration Fe$_{1-x}$Ni$_{x}$ alloys were
investigated using high resolution X-ray photoelectron spectroscopy (XPS) down
to 10K temperature. The Fe 2s core level exhibits three features, two low
binding features corresponding to exchange interaction between ionized 2s core
level and the unpaired 3d electrons. The high binding energy feature
corresponds to the screening of 2s core hole by 4s conduction electrons. Our
studies suggest high local magnetic moments on Fe sites.
