The 23S1-33P0 4He transition at λ0=389 nm is measured with respect to a previously frequency calibrated 87Rb two-photon transition at 2λ0=778 nm. The 4He absolute frequency is 770 732 839 058 (190) kHz, with an accuracy of 2.4 parts in 1010. A Lamb shift value of +4057.61 (79) MHz, with 600 kHz uncertainty arising from the theoretical position of the 33P0 energy level, is extraced for the 23S1 level. This value is more than 2 orders of magnitude more accurate than the current best theoretical predictions.
First Pure Frequency Measurement of an Optical Transition in Helium: Lamb Shift of the 23S1 Metastable Level / F. Pavone;F. Marin;P. De Natale;M. Inguscio;F. Biraben. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 73:(1994), pp. 42-45. [10.1103/PhysRevLett.73.42]
First Pure Frequency Measurement of an Optical Transition in Helium: Lamb Shift of the 23S1 Metastable Level
PAVONE, FRANCESCO SAVERIO;MARIN, FRANCESCO;DE NATALE, PAOLO;INGUSCIO, MASSIMO;
1994
Abstract
The 23S1-33P0 4He transition at λ0=389 nm is measured with respect to a previously frequency calibrated 87Rb two-photon transition at 2λ0=778 nm. The 4He absolute frequency is 770 732 839 058 (190) kHz, with an accuracy of 2.4 parts in 1010. A Lamb shift value of +4057.61 (79) MHz, with 600 kHz uncertainty arising from the theoretical position of the 33P0 energy level, is extraced for the 23S1 level. This value is more than 2 orders of magnitude more accurate than the current best theoretical predictions.
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