Multi-atom resonant X-ray emission in simple binary compounds

Abstract

Multi-atom resonance (MAR) is a phenomenon where core-electron emission from an atom is perturbated by the core-to-valence resonant excitation in the neighboring atom. Here, MAR’s in simple binary compounds were investigated both for solid and aqueous solution. For solid CaCl2, it was found that the intensity of Cl Kα X-rays was reduced when the energy of the incident X-rays was tuned at the resonance energy of the neighboring Ca K-edge, but such intensity reduction was not observed for aqueous solution of CaCl2. Similar results were also obtained for the KCl and SrCl2. Since we can determine the atomic species of the neighboring atom by this method, the observed phenomena will pave a way to a new structural analysis that is complimentary to the synchrotron-based X-ray spectroscopies such as extended X-ray absorption fine structure (EXAFS) and X-ray absorption near-edge structure (XANES).