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  Storage Ring Cross Section Measurements for Electron Impact Single and Double Ionization of Fe13+ and Single Ionization of Fe16+ and Fe17+

Hahn, M., Becker, A., Bernhardt, D., Grieser, M., Krantz, C., Lestinsky, M., et al. (2013). Storage Ring Cross Section Measurements for Electron Impact Single and Double Ionization of Fe13+ and Single Ionization of Fe16+ and Fe17+. Astrophysical Journal, 767(1): 47. doi:10.1088/0004-637X/767/1/47.

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Hahn, M.1, Autor
Becker, Arno2, Autor           
Bernhardt, D.3, Autor
Grieser, M.2, Autor           
Krantz, C.2, Autor           
Lestinsky, M.4, Autor
Mueller, A.3, Autor
Novotny, O.1, Autor
Repnow, R.2, Autor           
Schippers, S.3, Autor
Spruck, K.3, Autor
Wolf, A.2, Autor           
Savin, D. W.1, Autor
Affiliations:
1Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027, USA , ou_persistent22              
2Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society, ou_904548              
3 Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Giessen, Leihgesterner Weg 217, D-35392 Giessen, Germany , ou_persistent22              
4GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, D-64291 Darmstadt, Germany , ou_persistent22              

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 Zusammenfassung: We report measurements of electron impact ionization for Fe13 +, Fe16 +, and Fe17 + over collision energies from below threshold to above 3000 eV. The ions were recirculated using an ion storage ring. Data were collected after a sufficiently long time that essentially all the ions had relaxed radiatively to their ground state. For single ionization of Fe13 +, we find that previous single pass experiments are more than 40% larger than our results. Compared to our work, the theoretical cross section recommended by Arnaud & Raymond is more than 30% larger, while that of Dere is about 20% greater. Much of the discrepancy with Dere is due to the theory overestimating the contribution of excitation-autoionization via n = 2 excitations. Double ionization of Fe13 + is dominated by direct ionization of an inner shell electron accompanied by autoionization of a second electron. Our results for single ionization of Fe16 + and Fe17 + agree with theoretical calculations to within the experimental uncertainties.

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 Datum: 2013-03-22
 Publikationsstatus: Online veröffentlicht
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 Art der Begutachtung: -
 Identifikatoren: ISI: 000316947500047
DOI: 10.1088/0004-637X/767/1/47
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Titel: Astrophysical Journal
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Chicago, IL : University of Chicago Press for the American Astronomical Society
Seiten: - Band / Heft: 767 (1) Artikelnummer: 47 Start- / Endseite: - Identifikator: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_2