Nonresonant inelastic x-ray scattering involving excitonic excitations: the examples of NiO and CoO.

@article{Haverkort2007NonresonantIX,
  title={Nonresonant inelastic x-ray scattering involving excitonic excitations: the examples of NiO and CoO.},
  author={Maurits W. Haverkort and Akihiro Tanaka and Liu Hao Tjeng and George A. Sawatzky},
  journal={Physical review letters},
  year={2007},
  volume={99 25},
  pages={
          257401
        }
}
In a recent publication Larson et al. reported remarkably clear d-d excitations for NiO and CoO with x-ray scattering. Here we present an accurate quantitative description based on a local many body approach, beyond local density approximation + Hubbard U approximations. The magnitude of q[over -->] determines which of the allowed multipoles contributes most to the spectra. The direction of q[over -->] with respect to the crystal can be used as an equivalent to polarization similar to electron… 

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