Precision laser spectroscopy of helium
Autori: Inguscio M., Pavone F.S., Marin F., Minardi F., De Natale P., Giusfredi G., Sasso A.
Affiliazione autori: Univ of Florence, Firenze, Italy
Abstract: This paper describes recent progress in the helium spectroscopy at 398 nm starting form the metastable level 23S1. The first measurements have been obtained in a discharge absorption cell where the metastable helium is produced. In this work, results obtained with the discharge cell is compared with the measurements obtained by means of a metastable atomic beam where the atoms are less perturbed by systematics effects (collisions, as Stark fields, etc.). Also, an improvement in the two-photon spectrometer is considered, increasing the power and the spectral purity of the sources.
Parole chiavi: Atomic beams; Electron energy levels; Electron transitions; Fluorescence; Helium; Laser tuning; Spectrometers, Discharge absorption cell; Nuclear charge radius; One electron lamb shift; Precision laser spectroscopy; Spectral purity, SpectroscopyDOI: 10.1109/EQEC.1994.698104