Symmetry selection in polarized resonant X-ray emission spectroscopy in La2CuO4

Experimental and theoretical investigations are made for the polarization dependence in the resonant X-ray emission spectra due to the Cu 3d --> 2p electronic transition under the Cu 2p --> 3d resonant excitation (Cu 2p-RXES) in La2CuO4. It is shown that the polarization dependence of the Cu 2p-RXES can be deduced from the spectra obtained under the various geometrical configurations of the crystal axis, the polarization direction of the incident beam, and the direction of the detector. The calculated results are in fairly good agreement with the experimental results.