Precision measurement of the 2 sup 3 S r arrow 3 sup 3 P transition in sup 4 He

Journal Article · Sun Mar 01 00:00:00 EST 1992 · Physical Review A. General Physics; (United States)

DOI:https://doi.org/10.1103/PhysRevA.45.R2667· OSTI ID:7047700

Adams, C S; Riis, E; Ferguson, A I ^[1]; Rowley, W R.C. ^[2]

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1. Department of Physics and Applied Physics, University of Strathclyde, Glasgow G4 ONG (United Kingdom)
2. National Physical Laboratory, Teddington, Middlesex TW11 OLW (United Kingdom)

We report on a precision measurement of the 2 {sup 3}{ital S}--3 {sup 3}{ital P} transition in {sup 4}He. Doppler-free spectra of the transition were observed by exciting metastable helium atoms, produced by a chopped rf discharge, using 389-nm radiation generated by a frequency-doubled Ti-doped sapphire laser. A frequency measurement of the Doppler-free lines was made by interferrometric comparison of the Ti-doped sapphire frequency with that of an iodine-stabilized He-Ne laser using a 1-m evacuated Fabry-Perot etalon. The measurement uncertainty was 2 parts in 10{sup 9} (3 standard deviations), which gives an improvement of a factor of 60 in the term value of the 3 {sup 3}{ital P} level with respect to earlier measurements. This result makes it possible to determine the one electron Lamb-shift correction to the 3 {sup 3}{ital P} state with an accuracy of 0.8%.

• OSTI ID: 7047700
• Journal Information: Physical Review A. General Physics; (United States), Vol. 45:5; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
HELIUM 4
ENERGY-LEVEL TRANSITIONS
CORRECTIONS
ELECTRONIC STRUCTURE
LAMB SHIFT
LASER SPECTROSCOPY
METASTABLE STATES
P STATES
S STATES
TRIPLETS
ENERGY LEVELS
EVEN-EVEN NUCLEI
EXCITED STATES
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
MULTIPLETS
NUCLEI
SPECTRAL SHIFT
SPECTROSCOPY
STABLE ISOTOPES
664200* - Spectra of Atoms & Molecules & their Interactions with Photons- (1992-)