Study on the Ti K, L, and M Edges of SrTiO and PbTiO.

The multiplet theory of free ions combined with crystal field theory is used to study core electron excitation of perovskites. This combined method is helpful to further identify transition peaks and comprehend the transition mechanism. In this paper, the core electron excitation of Ti K edge, L edges, and M edge in SrTiO and PbTiO is studied, and the identification of peak and the analysis of spectral shape are emphasized. Especially at the M edge, we can identify the dipole and higher-order multiple transition peaks of Ti. At the L edges, the transition strength corresponding to the 2p3d configuration coupling affects the shape of the spectra. The correction of the crystal field can make the theoretical spectra more consistent with the experimental spectra. For the K edge in PbTiO, by comparing the spectral shapes and energy of Ti, Ti, and Ti with experiments, the spectrum is mainly composed of Ti and Ti, and the proportion of Ti is determined to be over 91%.