Forward-backward asymmetry in the inelastic scattering of electrons from highly charged ions

Energy-dependent, absolute differential cross sections for 1s2l excitation in F8+ by the scattering of quasi-free target electrons have been measured. The formation and subsequent decay of the F7+ (3lnl´) (n3) doubly excited intermediate states gives rise to a resonant inelastic scattering amplitude which is coherent with the nonresonant inelastic scattering. A strong forward-backward asymmetry was found for the inelastically scattered electrons due to the interference between these two scattering amplitudes. Close-coupling R-matrix calculations show excellent agreement with the experiment and thereby demonstrates a method for obtaining high-resolution, angle-resolved differential inelastic electron-ion scattering cross sections.

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