Interestingly we find that unlike at the |F1s -1 6a 1 1g resonance, TD-DFT/CAM-B3LYP fails to produce the correct polarization dependence for the 7t 1u resonance which is correctly predicted by DFT-ROCIS, see FIG. in SI. However the polarization dependence in correctly predicted for the 6t 1u resonance as shown in FIG. . For both the resonances, the energy loss predicted by TD-DFT/CAM-B3LYP turns out to be much more accurate. RIXS at the |F1s -1 2t 1 2g resonance: For the RIXS at the|F1s -1 2t 1 2g resonance, which in experiment was performed after excitation at 699.8 eV, we see that the most intense peak in the spectra has a more intense vertical polarization. This is observed only at the |F1s -1 2t 1 2g resonance. In our simulated spectra, we reproduce this feature accurately, see FIG. . Unlike in the |F1s -1 6a 1 1g resonance we see that here and in all the |F1s -1 t 1 1u resonances, the emission originating from 4t 1u orbital has significant intensity and is prominent. Interestingly we also see in FIG. and FIG. that for RIXS at the |F1s -1 2t 1 2g resonance, and to some extent for RIXS at the |F1s -1 6t 1 1u resonance, more final states contribute with considerable intensity to the emission spectra. As we see from FIG. , there is an additional peak inbetween that of 3e g and 5t 1u /1t 2u , which has relatively significant intensity as compared to as in the case of |F1s -1 6a 1 1g resonance. This is indicative of the fact that other states become accessible/allowed as final state for the |F1s -1 2t 1 2g resonance. The increased broadness of the main emission, i.e. peaked around 677.5 eV, for the |F1s -1 2t 1 2g resonance, could be due to contributions from these states. These states basically have mixed character with contribution of 5t 1u and 1t 2u orbitals, are states generating out of mixing of the |5t -1 1u 2t Simulated polarization dependent RIXS spectra at DFT-ROCIS/B3LYP and TD-DFT/CAM-B3LYP levels of theory for the |F1s -1 2t 1 2g resonance considering a localized core-hole, at 699.8 eV and with experimental spectrum obtained from Ref. . The polarization dependence was computed using Equation 10 in one-electron picture, and neglecting interference between intermediate states. The red spectra indicate spectra at horizontal polarization(χ = 0 0 ) and blue spectra represents vertical polarization (χ = 90 0 ).