Scientific Results

First pure frequency measurement of an optical transition in helium: Lamb shift of the 2(3)S(1) metastable level

Year: 1994

Authors: Pavone FS., Marin F., De Natale P., Inguscio M., Biraben F.

Autors Affiliation: Dipartimento di Fisica, Università di Firenze and European Laboratory for Nonlinear Spectroscopy (LENS) Largo E. Fermi 2, 50125 Firenze, Italy;
Laboratoire “Kastler-Brossel” de L’Ecole Normale Superieure, Universit√® P. e M. Curie, Paris, France

Abstract: The 2(3)S1-3(3)P0, He-4 transition at lambda0 = 389 nm is measured with respect to a previously frequency calibrated Rb-87 two-photon transition at 2lambda0 = 778 nm. The He-4 absolute frequency is 770732839058 (190) kHz, with an accuracy of 2.4 parts in 10(10). A Lamb shift value of +4057.61 (79) MHz. with 600 kHz uncertainty arising from the theoretical position of the 3(3)P0 energy level, is extracted for the 2(3)S1 level. This value is more than 2 orders of magnitude more accurate than the current best theoretical predictions.


Volume: 73 (1)      Pages from: 42  to: 45

KeyWords: Calculations; Electron energy levels; Electron transitions; Fluorescence; Frequency modulation; Helium; Laser beams; Phase modulation; Rubidium; Schottky barrier diodes; Semiconductor lasers, Beat note frequency; Gunn diode; Lamb shift; Metastable level; Optical transition; Two photon transition; Zeeman structure, Electric frequency measurement
DOI: 10.1103/PhysRevLett.73.42

Citations: 35
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