CC BY 4.0 UnportedAzoury, DoronKrüger, MichaelBruner, Barry D.Smirnova, OlgaDudovich, Nirit2023-03-282023-03-282021https://oa.tib.eu/renate/handle/123456789/11786http://dx.doi.org/10.34657/10819The Coulomb interaction between a photoelectron and its parent ion plays an important role in a large range of light-matter interactions. In this paper we obtain a direct insight into the Coulomb interaction and resolve, for the first time, the phase accumulated by the laser-driven electron as it interacts with the Coulomb potential. Applying extreme-ultraviolet interferometry enables us to resolve this phase with attosecond precision over a large energy range. Our findings identify a strong laser-Coulomb coupling, going beyond the standard recollision picture within the strong-field framework. Transformation of the results to the time domain reveals Coulomb-induced delays of the electrons along their trajectories, which vary by tens of attoseconds with the laser field intensity.enghttps://creativecommons.org/licenses/by/4.0500600530Article