title: X-ray resonant photoexcitation: linewidths and energies of Kα transitions in highly charged Fe ions.
abstract: Photoabsorption by and fluorescence of the Kα transitions in highly charged iron ions are essential mechanisms for x-ray radiation transfer in astrophysical environments. We study photoabsorption due to the main Kα transitions in highly charged iron ions from heliumlike to fluorinelike (Fe24+ to Fe17+) using monochromatic x rays around 6.6 keV at the PETRA III synchrotron photon source. Natural linewidths were determined with hitherto unattained accuracy. The observed transitions are of particular interest for the understanding of photoexcited plasmas found in x-ray binary stars and active galactic nuclei.
authors.affiliation: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany and Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Gießen, Leihgesterner Weg 217, 35392 Gießen, Germany.
authors.forename: J K
authors.initials: JK
authors.lastname: Rudolph
authors.affiliation: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Bernitt
authors.affiliation: Max Planck Advanced Study Group, CFEL, Notkestraße 85, 22607 Hamburg, Germany.
authors.forename: S W
authors.initials: SW
authors.lastname: Epp
authors.affiliation: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Steinbrügge
authors.affiliation: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany and Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Beilmann
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA.
authors.forename: G V
authors.initials: GV
authors.lastname: Brown
authors.affiliation: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Eberle
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA.
authors.forename: A
authors.initials: A
authors.lastname: Graf
authors.affiliation: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany and ExtreMe Matter Institute (EMMI), Planckstraße 1, 64291 Darmstadt, Germany.
authors.forename: Z
authors.initials: Z
authors.lastname: Harman
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA and Dr. Karl Remeis-Observatory and ECAP, Universität Erlangen Nürnberg, Sternwartstraße 7, 96049 Bamberg, Germany.
authors.forename: N
authors.initials: N
authors.lastname: Hell
authors.affiliation: NASA/Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, Maryland 20771, USA and Center for Space Sciences and Technology, University of Maryland, Baltimore County, Baltimore, Maryland 21250, USA.
authors.forename: M
authors.initials: M
authors.lastname: Leutenegger
authors.affiliation: Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Gießen, Leihgesterner Weg 217, 35392 Gießen, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Müller
authors.affiliation: Deutsches Elektronen-Synchrotron (PETRA III), Notkestraße 85, 22607 Hamburg, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Schlage
authors.affiliation: Deutsches Elektronen-Synchrotron (PETRA III), Notkestraße 85, 22607 Hamburg, Germany.
authors.forename: H-C
authors.initials: HC
authors.lastname: Wille
authors.affiliation: Deutsches Elektronen-Synchrotron (PETRA III), Notkestraße 85, 22607 Hamburg, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Yavaş
authors.affiliation: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Ullrich
authors.affiliation: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
authors.forename: J R
authors.initials: JR
authors.lastname: Crespo López-Urrutia