347258 20231206102621.0 10.11588/HEIDOK.00033938 doi urn:nbn:de:bsz:16-heidok-339389 URN urn:nbn:de:bsz:16-heidok-339389 URN GSI-2023-00967 English Sasidharan, Sangeetha P:(DE-HGF)0 0 Corresponding author female High-precision atomic mass measurement of helium-4 Heidelberg 2023 Heidelberg University Library 154 Output Types/Dissertation DataCite DISSERTATION ORCID PHDTHESIS BibTeX Thesis 2 EndNote Dissertation / PhD Thesis phd phd PUB:(DE-HGF)11 1701853009_2960485 PUB:(DE-HGF) doctoralThesis DRIVER Dissertation, Ruprecht-Karls-Universität Heidelberg, 2023 Ruprecht-Karls-Universität Heidelberg Dissertation 2023 2023-10-18 Penning-trap mass spectrometry enables a precise determination of atomic masses, supporting sensitive tests of fundamental physics. LIONTRAP (Light Ion TRAP) is a specialized mass spectrometer focused on precise mass measurements of light ions. In this experiment, we currently reach a relative resolution of 10 parts-per-trillion (ppt) and beyond for atomic masses. The measurement principle involves comparing the cyclotron frequencies of the ions under investigation and a carbon ion, which are inversely proportional to their masses. In the scope of this thesis, a high-precision mass measurement of 4He2+ was performed. To this end, a source for gaseous species was developed, and an extensive investigation of the systematics affecting the mass measurements, including image charge shift, lineshape systematics, and others, was conducted. The mass determined herein has a relative precision of 12 ppt. Based on this, the atomic mass of the neutral atom is determined from the binding energies and the electron mass without loss of precision. The mass value exhibits a precision that is 1.3 times greater than the current literature value but deviates from it by 6.6 combined standard deviations. This result contributes to fundamental physics by potentially supporting the improvement of the electron mass via a g-factor determination of 4He+. Towards the end of the thesis, new developments are presented, including a test of the two-ion balance technique to improve the precision of the upcoming mass measurement. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) G:(DE-HGF)POF4-631 POF4-631 POF IV 0 Dataset connected to DataCite 530 Physics Other theory no experiment theory work (theory) EXP:(DE-Ds200)theory-20200803 EXP:(DE-Ds200)no_experiment-20200803 EXP:(DE-Ds200)no_experiment-20200803 0 10.11588/HEIDOK.00033938 oai:repository.gsi.de:347258 VDB GSI Helmholtzzentrum für Schwerionenforschung GmbH I:(DE-Ds200)20121206GSI GSI 0 P:(DE-HGF)0 DE-HGF Forschungsbereich Materie Von Materie zu Materialien und Leben G:(DE-HGF)POF4-630 G:(DE-HGF)POF4-631 G:(DE-HGF)POF4 G:(DE-HGF)POF4-600 G:(DE-HGF)POF Matter – Dynamics, Mechanisms and Control 0 2023 yes I:(DE-Ds200)ATP-20051214OR020 ATP Atom-, Quanten- & Fundamentalphysik 0 phd VDB I:(DE-Ds200)ATP-20051214OR020 UNRESTRICTED