Charge dynamics in strongly correlated one-dimensional Cu-O chain   systems revealed by inelastic X-ray scattering
  We report on the Cu 1s resonant inelastic X-ray scattering (RIXS) of Cu-O one-dimensional (1D) strongly correlated insulator systems with contrasting atomic arrangements, namely edge-sharing CuGeO3 and corner-sharing Sr2CuO3. Owing to good statistics of the high-resolution RIXS data, so far unresolved fine structures are revealed. Detailed photon-energy and momentum dependence of the RIXS spectra in comparison with theoretical calculations has clarified the natures of the low-energy charge excitations and hybridization of the electronic states. 
S. Suga, S. Imada, A. Higashiya, A. Shigemoto, S. Kasai, M. Sing, H.   Fujiwara, A. Sekiyama, A. Yamasaki, C. Kim, T. Nomura...