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Updated: Jan 7, 2026

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Interferencia entre canales de uno y dos electrones en dispersión inelástica de rayos X resonante

Johan Söderström¹, Marcus Agåker^1,2, Ji-Cai Liu^3,4

¹Uppsala University, Department of Physics and Astronomy, Box 516, 751 20 Uppsala, Sweden.

Physical review letters

|December 19, 2025

Abstract:

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.

Palabras clave:

dispersión inelástica de rayos X resonante Ne K-edge interferencia de canales de dispersión efecto Fano perfiles de línea asimétricos

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