Measurement of the helium 2 P-3(0)-2(3)P(1) fine structure interval
Anno: 1999
Autori: Minardi F., Bianchini G., Cancio Pastor P., Giusfredi G., Pavone FS., Inguscio M.
Affiliazione autori: European Laboratory for Non-linear Spectroscopy (LENS), Largo E. Fermi 2, Firenze, 50125, Italy; Istituto Nazionale di Ottica (INO), Largo E. Fermi 6, Firenze, I-50125, Italy
Abstract: We report the most accurate measurement of the helium fine structure splitting. The 2(3)P(0)-2(3)P(1) energy splitting is 29 616 949.7 +/- 2.0 kHz. Laser saturation spectroscopy, heterodyne pure frequency determination, and fluorescence detection were combined in a novel experimental approach. The absence of external perturbing magnetic fields, used in earlier experiments, lends confidence to our determined value and allows us to discriminate between contradictory results previously reported. This result, when combined with expected advances in theory, should yield a new value of the fine structure alpha, which may help clarify a presently puzzling experimental situation. [S0031-9007(99)08416-1].
Giornale/Rivista: PHYSICAL REVIEW LETTERS
Volume: 82 Da Pagina: 1112 A: 1115
Parole chiavi: Helium; fine-structure; spectroscopyDOI: 10.1103/PhysRevLett.82.1112Citazioni: 80dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-04-14Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui