title: Electronic g factor of hydrogenlike oxygen 16O7+.
abstract: We present an experimental value for the g factor of the electron bound in hydrogenlike oxygen, which is found to be g(expt)=2.000 047 025 4 (15)(44). The experiment was performed on a single 16O7+ ion stored in a Penning trap. For the first time, the expected line shape of the g-factor resonance is calculated which is essential for minimizing the systematic uncertainties. The measurement agrees within 1.1 sigma with the predicted theoretical value g(theory)=2.000 047 020 2 (6). It represents a stringent test of bound-state quantum electrodynamics to a 0.25% level. Assuming the validity of the underlying theory, a value for the electron mass is obtained: m(e)=0.000 548 579 909 6 (4) u. This value agrees with our earlier determination on and allows a combination of both values which is about 4 times more precise than the currently accepted one.
authors.affiliation: Institut für Physik, Johannes-Gutenberg-Universität, D-55099 Mainz, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Verdú
authors.forename: S
authors.initials: S
authors.lastname: Djekić
authors.forename: S
authors.initials: S
authors.lastname: Stahl
authors.forename: T
authors.initials: T
authors.lastname: Valenzuela
authors.forename: M
authors.initials: M
authors.lastname: Vogel
authors.forename: G
authors.initials: G
authors.lastname: Werth
authors.forename: T
authors.initials: T
authors.lastname: Beier
authors.forename: H-J
authors.initials: HJ
authors.lastname: Kluge
authors.forename: W
authors.initials: W
authors.lastname: Quint