Interference between One- and Two-Electron Channels in Resonant Inelastic X-Ray Scattering
Johan Söderström1, Marcus Agåker1,2, Ji-Cai Liu3,4
1Uppsala University, Department of Physics and Astronomy, Box 516, 751 20 Uppsala, Sweden.
None:
Interference between scattering channels is observed in resonant inelastic x-ray scattering (RIXS) at the Ne K threshold. Final states with |2p^{-1}np⟩ as the main configuration are populated via |1s^{-1}n^{'}p⟩ resonances, where large-amplitude one-electron (n^{'}=n) channels interfere with small-amplitude two-electron (n^{'}≠n) channels. The interference is manifested in an asymmetric line profile where the two-electron resonance occurs in the tail region of the one-electron resonance. In RIXS, this slowly varying tail plays the role of the continuum for the Fano effect. The asymmetric profile is well modeled by means of a single asymmetry parameter, determined by the amplitudes of the scattering channels and the energy separation between the resonances.
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