One of the most important applications of X-ray spectroscopy is chemical state analysis. A research group led by Dr. M. Jaksic (Rudjer Boskovic Institute, Croatia) has recently reported chemical effects observed in high resolution Kβ spectra of Ti oxides and other compounds in the case of 2 MeV proton excitation. In addition to the determination of the oxidation number by the energy differences between Kβ1,3 and Kβ5, the sum of the relative intensities of Kβ2,5 and Kβ" can give information on the length of chemical bonds. The influence of self-absorption for thick samples on X-ray spectra is also discussed. For more information, see the paper, "Chemical effects on the Kβ" and Kβ2,5 X-ray lines of titanium and its compounds", L. Mandic et al., Phys. Rev. A80, 042519 (2009). Readers might be also interested in the recent synchrotron radiation studies on Ti oxides and other compounds reported by Dr. B. Beckoff's group (PTB, Germany), "Evaluation of high-resolution X-ray absorption and emission spectroscopy for the chemical speciation of binary titanium compounds", F. Reinhardt et al., Anal. Chem. 81, 1770 (2009).
