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Attosecond photoionization delays have mostly been interpreted within thesingle-particle approximation of multi-electron systems. The strong electroncorrelation between the photoionization channels associated with the 3p and 3sorbitals of argon presents an interesting arena where this single-particleapproximation breaks down. Around photon energies of 42~eV, the 3sphotoionization channel of argon experiences a ``Cooper-like" minimum, which isexclusively the result of inter-electronic correlations with the 3p shell.Photoionization delays around this ``Cooper-like" minimum have been predictedtheoretically, but experimental verification has remained a challenge since theassociated photoionization cross section is inherently very low. Here, wereport the measurement of photoionization delays around the Cooper-like minimumthat were acquired with the 100~kHz High-Repetition 1 laser system at theELI-ALPS facility. We report relative photoionization delays reaching up tounprecedented values of 430 +/- 20~as, as a result of electron correlation. Ourexperimental results are in partial agreement with state-of-the-art theoreticalresults, but also demonstrate the need for additional theoretical developments.

Effect of electron correlations on attosecond photoionization delays in the vicinity of the Cooper minima of argon