Abstract
Polarized resonant x-ray fluorescence spectroscopy at O $1s$ resonances was used to study ${\mathrm{CuGeO}}_{3}.$ Two distinct spectral contributions are identified, i.e., an intense ``main band'' of soft-x-ray fluorescence, reflecting primarily bandlike $\mathrm{O} 2p$ states, and resonant inelastic x-ray scattering (RIXS) characterized by spectral features that disperse linearly with excitation energy and resonate at the $\mathrm{O} 1s$ pre-edge peak. RIXS reflects excitoniclike (``optical'') final states and has previously only been observed for metal-ion core edges. Moreover, analysis of the excitation energy and polarization dependence of the main band allows the identification of features deriving from the site-specific partial density of states as well as strong evidence for the observation of a two-hole state (Zhang-Rice singlet).
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