Abstract

We have extended two-photon Doppler-free spectroscopy to the vacuum ultraviolet spectral region, to accurately measure the He 11S-21S transition at 120 nm. Our result is 4984872315(48) MHz. This yields a ground state Lamb shift of 41104(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.

Original Publication Citation

S. D. Bergeson, A. Balakrishnan, K. G. H. Baldwin, T. B. Lucatorto, J. P. Marangos, T. J. McIlrath, … E. E. Eyler. Measurement of the He ground state lamb shift via the two-photon 1(1)S-2(1)S transition. Phys. Rev. Lett. 80 (16), 3475-3478 (1998).

Document Type

Peer-Reviewed Article

Publication Date

1998

Publisher

American Physical Society

Language

English

College

Physical and Mathematical Sciences

Department

Physics and Astronomy

Included in

Physics Commons

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