For comparison to the experimental data, we calculated the RIXS profile for two angles χ between the polarization vector e of incoming photon and momentum k of scattered photon, χ = 0 0 and 90 0 . Our theoretical results explain observed polarization dependence of the experimental RIXS profile by its dependence on the mutual orientation of the dipole moments of core-excitation and emission transitions. Nuclear dynamics influences both electronically inelastic and elastic RIXS channels. Most strongly the nuclear dynamics affects the quasielastic RIXS channel through the dissociative intermediate |F1s -1 6a 1 1g state with a long vibrational progression.