Having initially examined the XA spectrum presented in FIG. , we simulated the static F1s RIXS spectra of SF 6 in the same theoretical framework using DFT-ROCIS and TD-DFT. The TD-DFT protocol within the restricted subspace approximation and DFT-ROCIS/B3LYP were chosen as methods of choice since they have been shown to perform well in simulating RIXS spectra in number of earlier studies . The computational details are given in the Methods section II. RIXS spectra were calculated for each of the |F1s -1 6a 1 1g , |F1s -1 t 1u (A) 1 , |F1s -1 t 1u (B) 1 , and |F1s -1 2t 1 2g resonances. Limitations in DFT-ROCIS leads to under/over estimation of energies for the valence excitations, and hence different shifts for the XA and RIXS spectra were employed. By applying the same constant energy blueshift of 17.1 eV as for the XE spectra in FIG. , we allow for a direct comparison of the XE and RIXS spectra on the emission energy scale, at the expense of miss-aligning the elastic peak. However, this shift used in RIXS spectra which is consistent with that used for aligning the XE spectrum, enabled us to discuss and compare both resonant and non-resonant emission spectra at a consistent and comparable level of theory, and in turn spectatorshift or binding energies could be deduced.