For comparison to the experimental set-up, we computed this function for two angles χ = 0 0 and χ = 90 0 ("horisontal" and "vertical" orientations of e and k ). Results of simulations for the RIXS channel at the |F1s -1 6a 1 1g resonance are collected in Table which describe the situation shown in Fig. . . Polarization of RIXS, at the |F1s -1 6a 1 1g resonance, for emission transitions ψ f → F 1s from different MOs ψ f (see Fig. ) at the TD-DFT level of theory. In the table polarization anisotropy is defined as