X-ray photo-electron spectra of Fe_2O_3, Fe_3O_4, α-FeOOH, γ-FeOOH, Cr_2O_3, Cr(OH)_3・0.4H_2O and CrO_3 were measured. The peak binding energies of 2p, 3s and 3p electrons of Fe and Cr in the above substances were determined. The largest valency dependence was observed in 2p electrons. Binding energies of O 1s electrons were also measured for those oxides and hydroxides. For quantitative analysis the ratios of photo-electron cross-sections of Fe 2p_<3/2> and Cr 2p_<3/2> to O 1s electron levels were estimated as 1.45 and 1.71, respectively, for excitation by A1 Kα_<1, 2> radiation.
Science reports of the Research Institutes, Tohoku University. Ser. A, Physics, chemistry and metallurgy 27 84-84, 1979