title: Observation of coherence in the time-reversed relativistic photoelectric effect.
abstract: The photoelectric effect has been studied in the regime of hard x rays and strong Coulomb fields via its time-reversed process of radiative recombination (RR). In the experiment, the relativistic electrons recombined into the 2p_{3/2} excited state of hydrogenlike uranium ions, and both the RR x rays and the subsequently emitted characteristic x rays were detected in coincidence. This allowed us to observe the coherence between the magnetic substates in a highly charged ion and to identify the contribution of the spin-orbit interaction to the RR process.
authors.affiliation: Physikalisches Institut der Universität Heidelberg, 69120 Heidelberg, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Tashenov
authors.affiliation: Institute of Physics, Jan Kochanowski University, 25-406 Kielce, Poland.
authors.forename: D
authors.initials: D
authors.lastname: Banaś
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Beyer
authors.affiliation: ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany and FIAS Frankfurt Institute for Advanced Studies, 60438 Frankfurt am Main, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Brandau
authors.affiliation: Helmholtz-Institut Jena, 07743 Jena, Germany and Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, 07743 Jena, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Fritzsche
authors.affiliation: ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany and FIAS Frankfurt Institute for Advanced Studies, 60438 Frankfurt am Main, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Gumberidze
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Hagmann
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany.
authors.forename: P-M
authors.initials: PM
authors.lastname: Hillenbrand
authors.affiliation: Physikalisches Institut der Universität Heidelberg, 69120 Heidelberg, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Jörg
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany.
authors.forename: I
authors.initials: I
authors.lastname: Kojouharov
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany.
authors.forename: Ch
authors.initials: Ch
authors.lastname: Kozhuharov
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Lestinsky
authors.affiliation: Physikalisches Institut der Universität Heidelberg, 69120 Heidelberg, Germany and GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany.
authors.forename: Yu A
authors.initials: YA
authors.lastname: Litvinov
authors.affiliation: St. Petersburg State University, 198504 St. Petersburg, Russia.
authors.forename: A V
authors.initials: AV
authors.lastname: Maiorova
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Schaffner
authors.affiliation: St. Petersburg State University, 198504 St. Petersburg, Russia.
authors.forename: V M
authors.initials: VM
authors.lastname: Shabaev
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany.
authors.forename: U
authors.initials: U
authors.lastname: Spillmann
authors.affiliation: Helmholtz-Institut Jena, 07743 Jena, Germany and Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, 07743 Jena, Germany.
authors.forename: Th
authors.initials: T
authors.lastname: Stöhlker
authors.affiliation: Helmholtz-Institut Jena, 07743 Jena, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Surzhykov
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany and Helmholtz-Institut Jena, 07743 Jena, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Trotsenko