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Phys. Rev. A 59, 245–250 (1999)

Measurement of the two-photon spectral distribution from decay of the 1s2s1S0 level in heliumlike nickel

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H. W. Schäffer1, R. W. Dunford2,*, E. P. Kanter2, S. Cheng3, L. J. Curtis3, A. E. Livingston4, and P. H. Mokler1
1Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany
2Physics Division, Argonne National Laboratory, Argonne, Illinois 60439
3Department of Physics and Astronomy, University of Toledo, Toledo, Ohio 43606
4Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556

Received 13 July 1998; published in the issue dated January 1999

A measurement of the shape of the spectral distribution of two-photon decay of the 1s2s1S0 level in heliumlike nickel is described. Uncertainties in detector efficiencies which had limited the precision of earlier measurements were eliminated by comparing the continuum emission from two-photon decays of H-like and He-like nickel. Our results are in agreement with the nonrelativistic calculation of Drake and the fully relativistic calculation of Derevianko and Johnson and suggest a method for testing relativistic atomic many-body theory in strong fields.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.59.245
DOI:
10.1103/PhysRevA.59.245
PACS:
32.70.Fw, 31.30.Jv, 31.10.+z, 32.30.Rj

*Author to whom correspondence should be addressed. Electronic address: dunford@anlphy.phy.anl.gov

 
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