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APS » Journals » Phys. Rev. Lett. » Volume 95 » Issue 23
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Phys. Rev. Lett. 95, 233003 (2005) [4 pages]

Measurement of the Two-Loop Lamb Shift in Lithiumlike U89+

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P. Beiersdorfer*, H. Chen, D. B. Thorn, and E. Träbert
Department of Physics and Advanced Technologies, Lawrence Livermore National Laboratory, Livermore, California 94550-9234, USA

Received 8 April 2005; published 1 December 2005

Using the SuperEBIT electron beam ion trap, we have measured the 2s1/2-2p1/2 transitions in U88+ and U89+. The measured value of 280.645±0.015  eV for Li-like U89+ improves the available precision by nearly an order of magnitude and establishes a new benchmark for testing the total QED contribution to the transition energy within a fractional accuracy of 3.6×10-4. We infer a value for the 2s two-loop Lamb shift in U89+ of -0.23  eV, from which we estimate a value of -1.27  eV for the 1s two-loop Lamb shift in U91+.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.233003
DOI:
10.1103/PhysRevLett.95.233003
PACS:
31.30.Jv, 12.20.Fv, 32.30.Rj

*Electronic address: beiersdorfer@llnl.gov

 
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