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Bulletin of the American Physical Society

Precision Measurements of the J=0 to J=2 Fine-Structure Interval in the Triplet 2P State of Helium-4

Marc Smiciklas, David Charles Shiner

Published May 29, 2010• 0 citations
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Anticrossing signals have been detected between n 1 D and n 3 D states of neutral He (n=5 to 7) using external electric field and internal singlet-triplet perturbations to couple the crossing states. Improved results for the n 1 D-n 3 D intervals are obtained: 34066.3(7.2), 20918.0(9.2) and 13632.8(5.3) MHz for n=5, 6, 7 respectively. This type of anticrossing also allows the study of the differential Stark effect, the anisotropic susceptibility chi A and the relativistic fine structure of the n 3 D states.