Laser spectroscopy measurement of the 2s-hyperfine splitting in lithium-like bismuth

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Title: Laser spectroscopy measurement of the 2s-hyperfine splitting in lithium-like bismuth
Authors: Sanchez, R
Lochmann, M
Joehren, R
Andelkovic, Z
Anielski, D
Botermann, B
Bussmann, M
Dax, A
Froemmgen, N
Geppert, C
Hammen, M
Kuehl, T
Litvinov, Y
Lopez-Coto, R
Steohlker, T
Thompson, R
Vollbrecht, J
Wen, W
Weinheimer, C
Will, E
Winters, D
Noertershaeuser, W
Item Type: Journal Article
Abstract: We have recently reported on the first direct measurement of the $2s$ hyperfine transition in lithium-like bismuth (209Bi80+) at the GSI Helmholtz Centre for Heavy Ion Research in Darmstadt, Germany. Combined with a new measurement of the $1s$ hyperfine splitting (HFS) in hydrogen-like (209Bi82+) the so-called specific difference ${\rm{\Delta }}^{\prime} E=-61.37(36)$ meV could be determined and was found to be in good agreement with its prediction from strong-field bound-state quantum electrodynamics. Here we report on additional investigations performed to estimate systematic uncertainties of these results and on details of the experimental setup. We show that the dominating uncertainty arises from insufficient knowledge of the ion beam velocity which is determined by the electron-cooler voltage. Two routes to obtain a cooler-voltage calibration are discussed and it is shown that agreement can be reached either between the experimental ${\rm{\Delta }}^{\prime} E$ and the theoretical result, or between the two measurements of the HFS in hydrogen-like bismuth, but not both at the same time.
Issue Date: 29-Mar-2017
Date of Acceptance: 1-Mar-2017
ISSN: 0953-4075
Publisher: IOP Publishing
Journal / Book Title: Journal of Physics B - Atomic Molecular and Optical Physics
Volume: 50
Issue: 8
Copyright Statement: © 2017 IOP Publishing Ltd.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/D068509/1
Keywords: Science & Technology
Physical Sciences
Physics, Atomic, Molecular & Chemical
laser spectroscopy
hyperfine structure
relativistic and QED effects in ions
General Physics
0202 Atomic, Molecular, Nuclear, Particle And Plasma Physics
0205 Optical Physics
0307 Theoretical And Computational Chemistry
Publication Status: Published
Article Number: 085004
Appears in Collections:Quantum Optics and Laser Science

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