Polarization Dependence of Resonant X-Ray Emission Spectra in 3d n Transition Metal Compounds with n = 0, 1, 2, 3

Abstract

The polarization dependence of 2p → 3d → 2p resonant X-ray emission spectroscopy (RXES) in 3d1, 3d2 and 3d 3 systems (TiF3, VF3 and Cr2O 3, respectively) is measured and analyzed by means of the MX 6 (M denotes a transition metal and X denotes a ligand, respectively) cluster model. The results are compared with a previous one for the 3d 0 system (TiO2). Generally, with increasing 3d electron number, the spectral structure of RXES becomes more complicated by the influence of the crystal field and the multiplet coupling effect. Moreover, we point out that the selection rules on the polarization dependence of RXES change with the 3d electron number and that a drastic resonance enhancement corresponding to the excitation to an antibonding state in the 3d0 system is almost absent for the 3dn systems with n = 1, 2 and 3.