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Polarization of K-shell dielectronic recombination satellite lines of Fe XIX-XXV and its application for diagnostics of anisotropies of hot plasmas

We present a systematic measurement of the X-ray emission asymmetries in the K-shell dielectronic, trielectronic, and quadruelectronic recombination of free electrons into highly charged ions. Iron ions in He-like through O-like charge states were produced in an electron beam ion trap, and the elect...

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Main Authors: Shah, Chintan (Author) , Amaro, Pedro (Author) , Steinbrügge, René (Author) , Bernitt, Sven (Author) , López-Urrutia, José R. Crespo (Author) , Tashenov, Stanislav (Author)
Format: Article (Journal)
Language:English
Published: 2018 February 1
In: The astrophysical journal. Supplement series
Year: 2018, Volume: 234, Issue: 2
ISSN:1538-4365
DOI:10.3847/1538-4365/aaa4c0
Online Access:Verlag, Volltext: https://doi.org/10.3847/1538-4365/aaa4c0
Verlag: https://doi.org/10.3847%2F1538-4365%2Faaa4c0
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Author Notes:Chintan Shah, Pedro Amaro, René Steinbrügge, Sven Bernitt, José R. Crespo López-Urrutia, and Stanislav Tashenov
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Summary:We present a systematic measurement of the X-ray emission asymmetries in the K-shell dielectronic, trielectronic, and quadruelectronic recombination of free electrons into highly charged ions. Iron ions in He-like through O-like charge states were produced in an electron beam ion trap, and the electron-ion collision energy was scanned over the recombination resonances. Two identical X-ray detectors mounted head-on and side-on with respect to the electron beam propagation recorded X-rays emitted in the decay of resonantly populated states. The degrees of linear polarization of X-rays inferred from observed emission asymmetries benchmark distorted-wave predictions of the Flexible Atomic Code for several dielectronic recombination satellite lines. The present method also demonstrates its applicability for diagnostics of energy and direction of electron beams inside hot anisotropic plasmas. Both experimental and theoretical data can be used for modeling of hot astrophysical and fusion plasmas.
Item Description:Gesehen am 01.10.2019
Physical Description:Online Resource
ISSN:1538-4365
DOI:10.3847/1538-4365/aaa4c0

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