Energies of some triplet levels in4He I
- 14 February 1983
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic and Molecular Physics
- Vol. 16 (3) , 381-388
- https://doi.org/10.1088/0022-3700/16/3/013
Abstract
The authors have used saturated absorption spectroscopy and a sigmameter to obtain the absolute wavelengths of the 2p 3P0,1,2-3d 3D1,2,3 transitions near 587.6 nm in 4He I. The precision is about eight parts in 109. By comparing with recent two-photon measurements of direct excitation from the 2s 3S1 level, they obtain values for the wavelengths of the 2s 3S1-2p 3P0,1,2 transitions. Precision calculations for these transitions are compared with experiment. In particular, the authors discuss the QED and relativistic corrections. The relative energies of many triplet levels in He I are analysed.Keywords
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