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Hyperfine structure of the 33 P state of3He and isotope shift for the 23 S-33 P 0 transition

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Zeitschrift für Physik D Atoms, Molecules and Clusters

Abstract

The hyperfine structure of the3He 1s 3p 3 P state and the3He-4He isotope shift is determined by high precision measurements of the 1s2s 3 S 1-1s 3p 3 p 3 P J transition frequencies near 389 nm. A direct frequency measurement is made without the need for wavelength calibration by tuning a single laser to the atomic frequency, and using a novel heterodyne method to observe beat frequencies with a stable reference laser. A fit to a theoretical model of hyperfine structure is used to determine the hyperfine shifts. Additional off-diagonal mixing effects are investigated to resolve a possible systematic discrepancy in the hyperfine intervals. The final isotope shift without hyperfine structure of 42184308±165 kHz is used to deduce an rms nuclear charge radius for3He of 1.956±0.042 fm. This is in good agreement with other values obtained from atomic isotope shift measurements, and a recent theoretical value of 1.958±0.006 fm. The present result helps to resolve substantial differences in the3He nuclear radius derived from electron-nuclear scattering measurements, and it provides a significant test of the nuclear three-body problem.

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Marin, F., Minardi, F., Pavone, F.S. et al. Hyperfine structure of the 33 P state of3He and isotope shift for the 23 S-33 P 0 transition. Z Phys D - Atoms, Molecules and Clusters 32, 285–293 (1995). https://doi.org/10.1007/BF01437272

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