<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Precision Mass and Mass-Ratio Measurements of Neon and Ytterbium Isotopes for Tests of Fundamental Physics"^^ . "During the research for this thesis, several mass ratios were measured with a relative uncertainty of a few\r\nparts per trillion using the cryogenic Penning trap mass spectrometer Pentatrap. The determination\r\nof the mass ratio of the 20Ne isotope against the 12C isotope reached a relative uncertainty of 4×10−12\r\nand, with a deviation of 4 standard deviations to the former literature value, results in the most precise\r\nmass measurement in atomic mass units to date and an improvement of this mass value by a factor of\r\nnineteen. This precision mass determination is used in a test of the theory of quantum electrodynamics\r\n(QED), especially confirming one- and two-loop corrections of bound-state QED at highest precision.\r\nThe determination of mass ratios between the five stable even ytterbium isotopes reached a precision of\r\nalso 4×10−12. These mass ratios are used in a King plot analysis of isotope shifts in atomic transitions to\r\nexclude the existence of a proposed new boson mediating a new 5th force. The measurements improve\r\nthe respective mass ratios determined from literature masses by one to two orders of magnitude. Lastly,\r\nthe binding energies of the valence electrons in 172Yb41+ and 172Yb42+ are determined to sub-eV\r\nprecision as a cross-check of the measurement accuracy and a test of the theoretical models and\r\nmethods used to calculate these binding energies.\r\n\r\nThe presented cyclotron frequency determinations show an improvement of at least a factor of two\r\ncompared to previous measurements of isotope mass ratios at Pentatrap and an improvement of a\r\nfactor of six in the determination of binding energies of highly charged ions, made possible by an upgrade\r\nof the experiments detection system within this thesis. The measurement of the mass of 20Ne was the\r\nfirst measurement of light ions and the first measurement against the atomic mass unit reference 12C\r\nat this experiment, and, with the precision demonstrated, paves the way for further high-precision mass\r\ndeterminations in atomic mass units in this experiment. The presented accuracy of binding energy determinations\r\nwill enable stringent tests of QED-theory in the future by determining the binding energies\r\nof electrons in heavier atoms and higher charge states."^^ . "2024" . . . . . . . "Menno"^^ . "Door"^^ . "Menno Door"^^ . . . . . . "Precision Mass and Mass-Ratio Measurements of Neon and Ytterbium Isotopes for Tests of Fundamental Physics (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Precision Mass and Mass-Ratio Measurements of Neon and Ytterbium Isotopes for Tests of Fundamental Physics (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Precision Mass and Mass-Ratio Measurements of Neon and Ytterbium Isotopes for Tests of Fundamental Physics (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Precision Mass and Mass-Ratio Measurements of Neon and Ytterbium Isotopes for Tests of Fundamental Physics (Other)"^^ . . . . . . "small.jpg"^^ . . . "Precision Mass and Mass-Ratio Measurements of Neon and Ytterbium Isotopes for Tests of Fundamental Physics (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "Precision Mass and Mass-Ratio Measurements of Neon and Ytterbium Isotopes for Tests of Fundamental Physics (PDF)"^^ . . . "thesis_door.pdf"^^ . . "HTML Summary of #35208 \n\nPrecision Mass and Mass-Ratio Measurements of Neon and Ytterbium Isotopes for Tests of Fundamental Physics\n\n" . "text/html" . . . "530 Physik"@de . "530 Physics"@en . .