Hannover 2020 – scientific programme
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A: Fachverband Atomphysik
A 1: Highly charged ions and their applications
A 1.2: Talk
Monday, March 9, 2020, 11:30–11:45, a320
Electron-impact single ionization of Wq+ ions: Experiment and theory for 11 ≤ q ≤ 18 — •Daniel Schury1,2, Alexander Borovik Jr3, Benjamin Ebinger3,4, Fengtao Jin3,5, Kaija Spruck1, Alfred Müller1, and Stefan Schippers3 — 1Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Gießen, 35392 Giessen, Germany — 2Institut des Nanosciences de Paris, Sorbonne Université, 75252 Paris, France — 3I. Physikalisches Institut, Justus-Liebig-Universität Gießen, 35392 Giessen, Germany — 4GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany — 5Department of Physics, National University of Defense Technology, 410022 Changsha, People’s Republic of China
Cross sections for electron-impact single ionization (EISI) of multiply charged tungsten ions (Wq+) with charge states in the range 11 ≤ q ≤ 18 in the electron-ion collision energy ranges from below the respective ionization thresholds up to 1000 eV were measured using the crossed-beams method and extrapolated up to 150 keV using subconfiguration-averaged distorted-wave (SCADW) theory [1]. Ionization rate coefficients were derived from the combined experimental and scaled theoretical cross sections and compared to the data contained in the ADAS database. Significant discrepancies were found in the temperature range where the ions investigated here are expected to form in collisionally ionised plasmas. [1] D Schury et al 2020 J. Phys. B: At. Mol. Opt. Phys. 53 015201