Schmid, GeorgSchnorr, KirstenAugustin, SvenMeister, SeverinLindenblatt, HannesTrost, FlorianLiu, YifanStojanovic, NikolaAl-Shemmary, AlaaGolz, TorstenTreusch, RolfGensch, MichaelKübel, MatthiasFoucar, LutzRudenko, ArtemUllrich, JoachimSchröter, Claus DieterPfeifer, ThomasMoshammer, Robert2023-12-072023-12-072019-02-19https://hdl.handle.net/2097/44051Time delays for atomic photoemission obtained in streaking or reconstruction of attosecond bursts by interference of two-photon transitions experiments originate from a combination of the quantum mechanical Wigner time and the Coulomb-laser coupling. While the former was investigated intensively theoretically as well as experimentally, the latter attracted less interest in experiments and has mostly been subject to calculations. Here, we present a measurement of the Coulomb-laser coupling-induced time shifts in photoionization of neon at 59.4 eV using a terahertz (THz) streaking field (λ=152 μm). Employing a reaction microscope at the THz beamline of the free-electron laser in Hamburg (FLASH), we have measured relative time shifts of up to 70 fs between the emission of 2p photoelectrons (∼38 eV) and low-energetic (<1 eV) photoelectrons. A comparison with theoretical predictions on Coulomb-laser coupling reveals reasonably good agreement.© American Physical Society (APS). This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).Text