Improved measurement of the /sup 4/He I 3 /sup 1/D-3 /sup 3/D separation: Confirmation of predicted mass-polarization isotopic shift

Journal Article · Fri Jul 01 04:00:00 EDT 1983 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.28.502· OSTI ID:5830496

Martin, W C; Sansonetti, C J

From new measurements of the /sup 4/He 1s2p-1s3d lines, we have determined the 3 /sup 1/D/sub 2/-3 /sup 3/D/sub 2/ separation to be 102 459(15) MHz. The corresponding nonrelativistic 1s3d singlet-triplet separation is 102 196(15) MHz, as compared with the value 102 116(5) MHz previously determined for the equivalent /sup 3/He separation. The difference of 80(16) MHz agrees with the predicted isotopic difference of these separations, the main contribution being a mass-polarization difference of 79 MHz as recently calculated by Drake. The experimental difference for 1s3d is consistent with the rough trend of such isotopic differences of 1snd singlet-triplet separations determined in previous experiments. We infer that mass-polarization shifts probably contribute significantly to the previously observed differences, at least up to napprox. =8.

• Research Organization: National Measurement Laboratory, National Bureau of Standards, Washington, DC 20234
• OSTI ID: 5830496
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 28:1; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
D STATES
DATA
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY LEVELS
EXPERIMENTAL DATA
FINE STRUCTURE
FLUIDS
GASES
HELIUM
INFORMATION
LASER RADIATION
NONMETALS
NUMERICAL DATA
RADIATIONS
RARE GASES
SPECTRAL SHIFT