Scientific Results

Precision spectroscopy of Helium

Year: 2005

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

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

Abstract: 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 (2 3S-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. © 2005 American Institute of Physics.

Journal/Review:

KeyWords: helium spectroscopy

gdpr-image
This site uses cookies. If you decide to continue browsing we consider that you accept their use. For more information about cookies and how to delete them please read our Info Policy on cookies use.
Read more