1ST PURE FREQUENCY-MEASUREMENT OF AN OPTICAL-TRANSITION IN HELIUM - LAMB SHIFT OF THE 2(3)S(1) METASTABLE LEVEL

Authors
PAVONE FS MARIN F DENATALE P INGUSCIO M BIRABEN F
Citation
Fs. Pavone et al., 1ST PURE FREQUENCY-MEASUREMENT OF AN OPTICAL-TRANSITION IN HELIUM - LAMB SHIFT OF THE 2(3)S(1) METASTABLE LEVEL, Physical review letters, 73(1), 1994, pp. 42-45
Citations number
24
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
73
Issue
1
Year of publication
1994
Pages
42 - 45
Database
ISI
SICI code
0031-9007(1994)73:1<42:1PFOAO>2.0.ZU;2-Z
Abstract
The 2(3)S1-3(3)P0, He-4 transition at lambda0 = 389 nm is measured wit h respect to a previously frequency calibrated Rb-87 two-photon transi tion 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 valu e of +4057.61 (79) MHz. with 600 kHz uncertainty arising from the theo retical 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.