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Charge-exchange studies of bare and hydrogen-like low-Z ions in the X-ray and extreme-ultraviolet ranges inside an electron beam ion trap

Dobrodey, Stepan

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Abstract

In this work, a cryogenic electron beam ion trap (EBIT) for charge breeding of rare, short-lived isotopes at the ARIEL facility at TRIUMF was designed and assembled for future investigations of astrophysical processes. It was characterized at a maximum electron-beam current of 1 A. Furthermore, charge-exchange (CX) processes, which are relevant for the interface between hot plasmas and cold gases in astrophysical environments, were extensively studied. In these experiments, hydrogen-like and bare sulfur, argon, and oxygen ions capturing electrons from various neutral gas targets into highly-excited states with subsequent radiative relaxation via emission of X-rays were investigated. Thereby, a possible explanation for the recently observed emission line at 3.5 keV in galaxy clusters, with a proposed origin in the decay of sterile neutrinos, was given, in the form of CX induced K-shell emission from hydrogen-like sulfur. Additionally, measurements of extreme-ultraviolet L-shell transitions following CX into highly ionized oxygen in the range between 8 nm and 20 nm, utilizing a grating spectrometer, is presented. The results are compared with different CX models, mainly based on the multichannel Landau-Zener approach. Significant discrepancies between various experiments and models, as well as the models among each other, were ascertained and are extensively discussed.

Item Type: Dissertation
Supervisor: Crespo López-Urrutia, PD Dr. José R.
Place of Publication: Heidelberg
Date of thesis defense: 30 October 2019
Date Deposited: 11 Nov 2019 09:47
Date: 2019
Faculties / Institutes: The Faculty of Physics and Astronomy > Dekanat der Fakultät für Physik und Astronomie
Service facilities > Graduiertenschulen > Graduiertenschule Fundamentale Physik (HGSFP)
Service facilities > Max-Planck-Institute allgemein > MPI for Nuclear Physics
Subjects: 530 Physics
Controlled Keywords: Ladungsaustausch, Atomphysik, Hochgeladene Ionen, Astrophysik, Röntgen-Spektroskopie
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