Abstract
Experimental electron energy-loss spectroscopy of OK edge in CaAl2O4 has been studied in this work. The near edge fine structure of the OK edge has been interpreted with the aid of theoretical calculations in the ground-state approximation. It reveals that the features near the threshold are associated with the coordination of Ca polyhedra. Time-resolved electron energy-loss spectroscopy of OK edge further confirms that the selective elimination of high-order coordinated Ca by electron irradiation results in a threshold shift of the OK edge.
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