Attosecond photoionization dynamics in the vicinity of the Cooper minima in argon

Abstract

Using a spectrally resolved electron interferometry technique, we measure photoionization time delays between the $3s$ and $3p$ subshells of argon over a large 34-eV energy range covering the Cooper minima in both subshells. The observed strong variations of the $3s-3p$ delay difference, including a sign change, are well reproduced by theoretical calculations using the Two-Photon Two-Color Random Phase Approximation with Exchange. Strong shake-up channels lead to photoelectrons spectrally overlapping with those emitted from the $3s$ subshell. These channels need to be included in our analysis to reproduce the experimental data. Our measurements provide a stringent test for multielectronic theoretical models aiming at an accurate description of inter-channel correlation.

References in corpus (6)

• Attosecond dynamics through a Fano resonance: Monitoring the birth of a photoelectron
• Attosecond delays in molecular photoionization
• Attosecond-resolved photoionization of chiral molecules
• Phase-resolved attosecond near-threshold photoionization of molecular nitrogen
• Study of attosecond delays using perturbation diagrams and exterior complex scaling
• Effect of electron correlations on attosecond photoionization delays in the vicinity of the Cooper minima of argon

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• Attosecond Time Delays at Cooper Minima in Valence-Shell Photoionization of Alkali and Alkaline-Earth Metal Atoms