APS » PROLA » Phys. Rev. Lett. » Volume 91 » Issue 4

Phys. Rev. Lett. 91, 043004 (2003) [4 pages]

Hyperfine Splitting, Isotope Shift, and Level Energy of the 3S States of 6,7Li
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B. A. Bushaw1, W. Nörtershäuser2, G. Ewald2, A. Dax2 *, and G. W. F. Drake3
1Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, USA
2Gesellschaft für Schwerionenforschung, 64291 Darmstadt, Germany
3Department of Physics, University of Windsor, Windsor, Ontario, Canada N9B3P4

Received 13 March 2003; published 25 July 2003

We study the 2S-3S transition of 6,7Li by high-precision laser spectroscopy using two-photon Doppler-free excitation and photoionization detection. Interferometric cross referencing to metrologic Rb 3S-5D two-photon transitions allowed measurement of the transition isotope shift and hyperfine splitting in the 3S state with precision at the 30 kHz level. The results are IS=11 453.734(30)  MHz, A3S(6Li)=35.263(15)  MHz, and A3S(7Li)=93.106(11)  MHz. Combined with recent theoretical work, the isotope shift yields a new value for the change in squared nuclear charge radii ΔR2=0.47(5)   fm2. This is compared with other work and some existing discrepancies are resolved.


©2003 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v91/e043004
DOI: 10.1103/PhysRevLett.91.043004
PACS: 32.10.Fn, 21.10.Ft, 31.30.–i, 32.30.Jc

* Current address: Paul Scherrer Institut, 5232 Villingen PSI, Switzerland.

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