Absolute frequency measurements of the 2(3)S(1)-> 2(3)P(0,1,2) atomic helium transitions around 1083 nm

Year: 2004

Authors: Cancio P., Giusfredi G., De Natale P., Hagel G., de Mauro C., Inguscio M.

Autors Affiliation: Istituto Nazionale di Ottica Applicata (INOA), Largo E. Fermi 6, Firenze, I-50125, Italy; European Laboratory for Non-Linear Spectroscopy (LENS) and Dipartimento di Fisica, Universitá di Firenze, Via N. Carrara 1, Sesto Fiorentino, I-50019, Italy

Abstract: We measure the frequency of the 23S1-23P0,1,2 transitions of helium in a metastable beam using an optical frequency comb synthesizer. The relative uncertainty of these measurements ranging from 5×10-11 to 7×10-12 is, to our knowledge, the most precise result for any optical helium transition. Considering existing accurate values of the 23P fine structure, we measure a centroid value of the 23S-23P frequency of 276 736 495 624.6(2.4) kHz, improving the previous interferometric measurement by 30 times. New accurate values of the 23S-23P and 23P Lamb-shift energies are obtained.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 92 (2)      Pages from: 023001-1  to: 023001-4

KeyWords: Helium; metrology; fine-structure constant
DOI: 10.1103/PhysRevLett.92.023001

Citations: 88
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