Precision spectroscopy of Helium
- Istituto Nazionale di Ottica Applicata (INOA), L.go E. Fermi 6, 50125 Florence (Italy)
- European Laboratory for Non-Linear Spectroscopy (LENS), Via N. Carrara 1, 50019 Sesto Fiorentino (Italy)
- European Laboratory for Non-Linear Spectroscopy - LENS, Via N. Carrara 1, 50019 Sesto Fiorentino (Italy) and Dipartimento di Fisica-Universita di Firenze Via N. Carrara 1, 50019 Sesto Fiorentino (Italy)
Accurate Quantum-Electrodynamics (QED) tests of the simplest bound three body atomic system are performed by precise laser spectroscopic measurements in atomic Helium. In this paper, we present a review of measurements between triplet states at 1083 nm (23S-23P) and at 389 nm (23S-33P). In 4He, such data have been used to measure the fine structure of the triplet P levels and, then, to determine the fine structure constant when compared with equally accurate theoretical calculations. Moreover, the absolute frequencies of the optical transitions have been used for Lamb-shift determinations of the levels involved with unprecedented accuracy. Finally, determination of the He isotopes nuclear structure and, in particular, a measurement of the nuclear charge radius, are performed by using hyperfine structure and isotope-shift measurements.
- OSTI ID:
- 20718893
- Journal Information:
- AIP Conference Proceedings, Vol. 770, Issue 1; Conference: ICAP 2004: 19. international conference on atomic physics, Rio de Janeiro (Brazil), 25-30 Jul 2004; Other Information: DOI: 10.1063/1.1928843; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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