Measurement of the two-photon spectral distribution from decay of the <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mn>1</mn><mi>s</mi><mn>2</mn><mi>s</mi><mrow><msup><mrow><mi></mi></mrow><mrow><mn>1</mn></mrow></msup></mrow><mrow><msub><mrow><mi>S</mi></mrow><mrow><mn>0</mn></mrow></msub></mrow></math></span> level in heliumlike nickel

H. W. Schäffer; R. W. Dunford; E. P. Kanter; S. Cheng; L. J. Curtis; A. E. Livingston; P. H. Mokler

doi:10.1103/PhysRevA.59.245

Measurement of the two-photon spectral distribution from decay of the $1 s 2 s^{1} S_{0}$ level in heliumlike nickel

H. W. Schäffer, R. W. Dunford, E. P. Kanter, S. Cheng, L. J. Curtis, A. E. Livingston, and P. H. Mokler

Phys. Rev. A 59, 245 – Published 1 January 1999

Abstract

A measurement of the shape of the spectral distribution of two-photon decay of the $1 s 2 s^{1} S_{0}$ 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.

Received 13 July 1998

DOI:https://doi.org/10.1103/PhysRevA.59.245

Authors & Affiliations

H. W. Schäffer¹, R. W. Dunford^2,*, 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

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

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Vol. 59, Iss. 1 — January 1999

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