The RIXS at the |F1s -1 6a 1 1g resonance was also computed at the restricted sub-space TD-DFT, method, as discussed earlier in Methods section II, since TD-DFT calculations with the B3LYP and CAM-B3LYP functionals have been known to predict valence-excited states accurately. In FIG. , we plot the static RIXS spectra at the |F1s -1 6a 1 1g resonance, computed at the restricted sub-space TD-DFT/CAM-B3LYP and DFT-ROCIS levels of theory. The DFT-ROCIS and TD-DFT methods produce similar static RIXS spectra. However both levels of theory consistently predicts a too high peak corresponding to |3e -1 3g 6a 1 1g and |1t -1 2g 6a 1 1g states, and the relative sharpness of the main peak is not captured. Thus it is shown here that though some of the essential features and position of the peaks are dependent on the method used, the entire RIXS spectra is not well reproduced using static geometry of computation, and thus neglecting vibronic coupling. Essentially both the DFT-ROCIS and restricted sub-space TD-DFT/CAM-B3LYP methods predict similar spectra with the same success and shortcomings common to both DFT-ROCIS and TD-DFT. However obviously the the predicted energies of the valence-excited state reflected in the RIXS spectra and energy-loss vary from one theory to the other.