Precision laser spectroscopy of the ground state hyperfine splitting of hydrogenlike ^209 Bi^82+
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The first direct observation of a hyperfine splitting in the optical regime is reported. The wavelength of the M1 transition between the F = 4 and F = 5 hyperfine levels of the ground state of hydrogenlike ^209 Bi^82+ was measured to be \lamda_0 = 243.87(4) nm by detection of laser induced fluorescence at the heavy-ion storage ring ESR at GSI. In addition, the lifetime of the laser excited F = 5 sublevel was determined to be \tau_0 = 0.351(16) ms. The method can be applied to a number of other nuclei and should allow a novel test of QED corrections in the previously unexplored combination of strong magnetic and electric fields in highly charged ions.
@article{urn:nbn:de:hebis:34-2008092223982,
author ={Klaft, Ingo and Borneis, Stefan and Engel, Thomas and Fricke, Burkhard and Grieser, Ralf and Huber, Gerhard and Kühl, Thomas and Marx, Dieter and Neumann, Reinhard and Schröder, Sönke and Seelig, Peter and Völker, Lothar},
title ={Precision laser spectroscopy of the ground state hyperfine splitting of hydrogenlike ^209 Bi^82+},
copyright ={https://rightsstatements.org/page/InC/1.0/},
language ={en},
year ={1994}
}