eprintid: 27344
rev_number: 16
eprint_status: archive
userid: 4764
dir: disk0/00/02/73/44
datestamp: 2019-11-11 09:47:01
lastmod: 2019-11-21 12:06:23
status_changed: 2019-11-11 09:47:01
type: doctoralThesis
metadata_visibility: show
creators_name: Dobrodey, Stepan
title: 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
subjects: 530
divisions: 130001
divisions: 741010
divisions: 851340
adv_faculty: af-13
cterms_swd: Ladungsaustausch
cterms_swd: Atomphysik
cterms_swd: Hochgeladene Ionen
cterms_swd: Astrophysik
cterms_swd: Röntgen-Spektroskopie
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.
date: 2019
id_scheme: DOI
id_number: 10.11588/heidok.00027344
ppn_swb: 1681576694
own_urn: urn:nbn:de:bsz:16-heidok-273444
date_accepted: 2019-10-30
advisor: HASH(0x564e1c34d5b0)
language: eng
bibsort: DOBRODEYSTCHARGEEXCH2019
full_text_status: public
place_of_pub: Heidelberg
citation:   Dobrodey, Stepan  (2019) 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.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/27344/1/Dobrodey_PhD_Final.pdf