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High-resolution resonant inelastic x-ray scattering (RIXS) spectra from CuO in the 1s2p emission region were measured. A surprisingly complicated set of spectra was observed. Detailed analysis of these spectra reveals the existence of an excited state, which is hidden in the Cu-K x-ray absorption spectrum of CuO. Furthermore, the energy of this excited state corresponds well to a Cu4pz-like state predicted by a real-space multiple-scattering technique, but has not been observed experimentally up to now. This result demonstrates the potential use of RIXS to complement x-ray absorption spectroscopy.

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This page is a summary of: Hidden electronic state of CuO revealed by resonant inelastic x-ray scattering, July 2002, American Physical Society (APS),
DOI: 10.1103/physrevb.66.033105.
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