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Soft X-Ray Appearance Potential Spectra of Titanium Oxide and Alloy

SXAPS(Soft X-Ray Appearance Potential Spectroscopy) of titanium oxides and a Ti–Ni(Ni 3.5 wt. %) alloy were studied. Chances in the O(K) spectrum and Ti(L3,2) spectra after sputtering and annealing were observed. The binding energy of Ti(L3) increases with the oxidation number and is in good agreement with soft X-ray absorption spectra. The changes of the separated L3 spectrum correspond to those of soft X-ray absorption spectra. The two subpeaks in Ti2O3 and TiO2 seem to occur from two narrow d bands. The spectrum expected from the theoretical band structure of TiO roughly agrees with the experimental spectrum.