TY  - GEN
TI  - First High-Precision Mass Measurements at PENTATRAP on highly charged Xe and Re ions
ID  - heidok27646
AV  - public
Y1  - 2020///
A1  - Schüßler, Rima Xenia
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/27646/
N2  - 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 ?ve Penning traps, which allows simultaneous measurements of single ions in
the traps. In the scope of this thesis, the ?rst high-precision mass measurements with a
relative precision partially below ?m/m ? 10?11 were performed. As a ?rst benchmark

test, the mass di?erences of ?ve xenon isotope pairs were determined. Comparison to
the literature values led to an improvement of the uncertainty of the mass di?erences 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 di?erence 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 di?erence measurements, con?rmed by theory, extends
the applicability of Penning-trap mass spectrometry to tests of atomic structure theories
and to the identi?cation of long-lived excited states for a possible new generation of clocks
using highly charged ions.
CY  - Heidelberg
ER  -