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Phys. Rev. Lett. 80, 3475–3478 (1998)

Measurement of the He Ground State Lamb Shift via the Two-Photon 11S-21S Transition

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S. D. Bergeson, A. Balakrishnan*, K. G. H. Baldwin†, T. B. Lucatorto, J. P. Marangos‡, T. J. McIlrath§, T. R. O'Brian, S. L. Rolston, C. J. Sansonetti, Jesse Wen, and N. Westbrook**
National Institute of Standards and Technology, Gaithersburg, Maryland 20899-0001

C. H. Cheng and E. E. Eyler
University of Connecticut, Department of Physics, 2152 Hillside Road, Storrs, Connecticut 06269-3046

Received 23 October 1997; published in the issue dated 20 April 1998

We have extended two-photon Doppler-free spectroscopy to the vacuum ultraviolet spectral region, to accurately measure the He 11S-12S transition at 120 nm. Our result is 4 984 872 315(48) MHz. This yields a ground state Lamb shift of 41 104(48) MHz, in fair agreement with theory and other experiments. This approach has the potential for significantly better accuracy once improvements in the laser and the wavelength metrology are implemented.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.80.3475
DOI:
10.1103/PhysRevLett.80.3475
PACS:
31.30.Jv, 32.70.Jz

*Present address: SDL Inc., 80 Rose Orchard Way, San Jose, CA 95134.

†Present address: Australian National University, Canberra ACT 0200 Australia.

‡Present address: Imperial College, London, England.

§Present address: Institute for Physical Science and Technology, University of Maryland, College Park, MD 20742.

**Present address: Institut d'Optique, Orsay, France.

 
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