Konstanz 1998 – scientific programme
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A: Atomphysik
A 8: Spektroskopie II
A 8.5: Talk
Tuesday, March 17, 1998, 15:00–15:15, A701
Ground State Hyperfine Splitting of Hydrogen-like 207Pb81+ by Laser Excitation of a Bunched Ion Beam in the ESR — •P. Seelig1, S. Borneis2, A. Dax2, S. Farber2, M. Gerlach2, D. Marx2, W. Quint2, G. Huber1, T. K"uhl2, F. Schmitt2, H. Winter2, and M. W"urtz3 — 1Institut f"ur Physik, Universit"at Mainz — 2Gesellschaft f"ur Schwerionenforschung mbH, Darmstadt — 3Institut f"ur Angewandte Physik, Technische Universit"at Darmstadt
The measurement of the ground-state hyperfine-structure transition in heavy ions provides an outstanding test case for the electromagnetic interaction in a combination of strong electric and magnetic fields.
Using a new bunched-beam technique in the GSI
heavy-ion storage ring (ESR), we performed precision laser spectroscopy on relativistic heavy ions in the hitherto inaccessible infrared optical region . We determined the wavelength of the M1-transition between the F = 1 (τ≈ 50 ms) and F = 0
hyperfine states of the 1s ground state of hydrogen-like
207Pb81+. The measured value of
1019.7(2) nm is compared with the very recent theoretical predictions.
A discrepancy of 5 nm is found. Because the
nucleus of
207Pb81+ is well described by the single-particle shell
model, uncertainties in corrections due to nuclear effects are expected to be small.
As a result, these uncertainties are a less persuasive explanation of
the disagreement between experiment and theory than was the case for
measurements of the hydrogen-like 209Bi82+.
I. Klaft et al., Phys. Rev. Lett. 73, 2425 (1994)