Phys. Rev. Lett. 78, 3658–3661 (1997)Accurate Measurement of the 23S1-33D1 Two-Photon Transition Frequency in Helium: New Determination of the 23S1 Lamb ShiftReceived 10 February 1997; published in the issue dated 12 May 1997 We have performed a precise measurement of the 32S1-33D1 two-photon transition frequency in 4He at 762 nm. The 32S1-33D1 frequency is 786 823 850.002(56) MHz, with a relative uncertainty of 7.1×10-11. The deduced 32S1 Lamb shift is 4057.276(60) MHz. This result, the most accurate at the present time, reduces the uncertainty in the 32S1 Lamb shift by 1 order of magnitude and is 100 times more precise than the theoretical prediction [4062.3(8.0) MHz]. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.78.3658
DOI:
10.1103/PhysRevLett.78.3658
PACS:
32.30.Jc, 12.20.Fv, 31.30.Jv
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