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Revealing photoionization dynamics using attosecond spectroscopy
Prof. Dr. Pascal Salières | Université Paris-Saclaytalks about
In a recent series of experiments, we were able to reconstruct the full ionization dynamics in structured continua by performing an advanced characterization (spectral amplitude and phase) of the released electron wavepackets (EWP), using a spectrally resolved electron interferometry technique called Rainbow RABBIT. This allows reconstructing complete autoionization dynamics including the resonance buildup, and evidences how photoelectron wavepackets are born and morph into asymmetric Fano profiles [1,2]. During this Colloquium, I will review the recent studies performed at CEA-Saclay, with a special emphasis on two cases. First, the technique was used to disentangle the overlapping contributions of different subshells, and to access their relative ionization delays in regions of Cooper minima involving intershell correlation . Second, the question of the coherence in photoionization experiments will be addressed with a quantum state tomography of the EWP that provides a measurement of decoherence due to entanglement with unobserved degrees of freedom .
 Gruson V et al 2016 Science354 6313
 Barreau L et al 2019 Phys. Rev. Lett.122, 253203
 Alexandridi C. et al 2021 Phys. Rev. Research, in print
 Bourassin-Bouchet C et al 2020 Phys. Rev. X 10, 031048