%0 Generic
%A Schüßler, Rima Xenia
%C Heidelberg
%D 2020
%F heidok:27646
%R 10.11588/heidok.00027646
%T First High-Precision Mass Measurements at PENTATRAP on highly charged Xe and Re ions
%U https://archiv.ub.uni-heidelberg.de/volltextserver/27646/
%X The high-precision Penning-trap mass spectrometer Pentatrap was designed to perform  mass-ratio measurements of highly charged ions with relative uncertainties of 10−11. The  unique features of the Pentatrap experiment are the external ion sources providing  highly charged ions, the detection systems with single-ion sensitivity and especially the  stack of five Penning traps, which allows simultaneous measurements of single ions in  the traps. In the scope of this thesis, the first high-precision mass measurements with a  relative precision partially below δm/m ≈ 10−11 were performed. As a first benchmark    test, the mass differences of five xenon isotope pairs were determined. Comparison to  the literature values led to an improvement of the uncertainty of the mass differences of  a factor between 4 and 1700, in agreement with literature. In order to demonstrate the  accuracy of Pentatrap, the binding energy of the 37th electron in 132Xe was determined  as a proof-of-principle measurement by determining the mass difference of 132Xe17+ and  132Xe18+. The agreement of the result with theory allows performing stringent tests of  quantum electrodynamics using binding energies in ions with an even higher charge state  in the future. Lastly, the discovery of metastable electronic states in highly charged rhe-  nium and osmium ions by mass difference measurements, confirmed by theory, extends  the applicability of Penning-trap mass spectrometry to tests of atomic structure theories  and to the identification of long-lived excited states for a possible new generation of clocks  using highly charged ions.