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Measuring the delay for an electron to emerge from different states is one ofthe major achievements of attosecond science. This delay can have two origins -the electron wave packet is reshaped during departure by the electrostaticfield of the ionizing medium or it is modified by dynamic interaction with theremaining electrons. Most experiments have observed the former, butconfirmation requires a complex calculation. A direct measurement ofmultielectron dynamics is needed. Photo-recombination - the inverse ofphotoionization - occurs naturally during electron recollision and can bemeasured by combining a perturbing beam to modify the recollision electronbefore recombination. These in situ methods allow us to unambiguously isolatemultielectron dynamics - the reference being the spectral phase of anattosecond pulse simultaneously measured in spectral regions withoutmultielectron interaction. Here, we measure the group delay of the recollisionelectron caused by plasmonic resonance dynamics in Xe, simulate the in situmeasured spectral phase of a recollision electron generated in the presence ofthe plasmonic resonance in C$_{60}$ and present a corresponding semi-classicaltheory based on the strong-field approximation. Our results suggest that insitu techniques, together with 300 eV recollision electrons, will allow theultimate time response of electronic matter to be measured.

Characterizing multielectron dynamics during recollision