Present status of the fine-structure frequencies of the 2(3)P helium level

Year: 2005

Authors: Giusfredi G., Cancio P., De Natale P., Mazzotti D., de Mauro C., Fallani L., Hagel G., Krachmalnicoff V., Inguscio M.

Autors Affiliation: Istituto Nazionale di Ottica Applicata (INOA) – CNR
European Laboratory for Non-linear Spectroscopy (LENS)
Dipartimento di Fisica, Università di Firenze
Dipartimento di Fisica, Università di Siena

Abstract: A new measurement of the fine-structure frequencies of the 2(3) P level in He-4 is presented. The result for the largest interval 2(3) P-0-2(3) P-1 is 29 616 952.7(1.0) kHz, and 2 291 167.7(11.0) kHz for the smallest one, 2(3) P-1-2(3) P-2. Taking into account this new result, an agreement among different experiments at the 1 kHz level is found. Implications of this situation for the determination of the fine-structure constant alpha are discussed.

Journal/Review: CANADIAN JOURNAL OF PHYSICS (PRINT)

Volume: 83 (4)      Pages from: 301  to: 310

KeyWords: helium spectroscopy; fine structure;
DOI: 10.1139/P04-075

Citations: 44
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