Photoabsorption of Ba 4^→d4f in some solid barium compounds

High-resolution photoabsorption spectra of Ba 4^→d4f in the solids of barium compounds of BaO, BaS, BaF₂, BaCl₂, BaI₂, and BaCO₃ have been measured by using synchrotron radiation. The two distinguished photoabsorption lines observed in this work in the energy range of 9297eV are identified to be atomlike spectra of barium arising, respectively, from the transitions of 4d¹⁰¹S₀ to 4d⁹4f¹³P₁ and 4d94f13D1. The line shapes and the peak energies of the photoabsorption lines from 4d¹⁰¹S₀→4d⁹4f¹³D₁ of these compounds have been determined by a curve-fit analysis. Below the resonance peak, some satellites are found in the solids of BaF₂, and BaCl₂. No such satellites can be identified in the other solids. The variation of the peak energies of the halides can be attributed mostly to the variation of the coordination charge of Ba ions as calculated by a simple formula, but it is not so for the oxides.