Spin–orbit-resolved spectral phase measurements around a Fano resonance

Abstract

Abstract We apply a spectrally-resolved electron interferometry technique to the measurement of the spectral phase in the vicinity of the 3s 1 3p 6 4p Fano resonance of argon. We show that it allows disentangling the phases of the two nearly-overlapping electron wavepackets corresponding to different spin–orbit final states. Using simple assumptions, it is possible to process the experimental data and numerically isolate each component in a self-consistent manner. This in turn allows reconstructing the autoionization dynamics of the dominant channel.