Radiationless resonant Raman scattering at the Ar K edge

Partial cross sections for Ar ${K-L}_2{L}_3{(}^1{D}_2)np,$ $n=4\mathrm{}$ and 5 spectator Auger states excited by x-ray absorption across the K edge, were measured and compared with calculations based on the theory of radiationless resonant Raman scattering. Core relaxation and coherence among bound and continuum intermediate states produce shake-up, shake-down, and photoelectron-recapture effects in the cross sections. The width and position of the $4p$ spectator Auger peak are shown to be sensitive to resonance structure in the partial cross section via averaging over the x-ray bandwidth.