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Phys. Rev. Lett. 94, 133001 (2005) [4 pages]

Fine Structure of the 1s3p   3PJ Level in Atomic 4He: Theory and Experiment

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P. Mueller1,*, L.-B. Wang1,2, G. W. F. Drake3,†, K. Bailey1, Z.-T. Lu1,4, and T. P. O’Connor1
1Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
2Physics Department, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
3Physics Department, University of Windsor, Windsor, Ontario, Canada N9B 3P4
4The Enrico Fermi Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637, USA

Received 22 July 2004; published 7 April 2005

The fine structure intervals in helium have been the focus of many theoretical and experimental studies in recent years with most of them concentrating on the 1s2p   3PJ levels. Here, we report on a theoretical calculation and an experimental determination of the 1s2p   3PJ fine structure intervals. The values from the theoretical calculation are 8113.730(6) and 658.801(6) MHz for the ν01 and ν12 intervals, respectively. The laser spectroscopic measurement reported here yields 8113.714(28) and 658.810(18) MHz for these intervals and is in excellent agreement with the theoretical calculation. Both, however, disagree significantly with the previous most precise experimental results.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.133001
DOI:
10.1103/PhysRevLett.94.133001
PACS:
31.15.Ar, 32.10.Fn

*Electronic address: pmueller@anl.gov

†Electronic address: gdrake@uwindsor.ca

 
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