Photoabsorption and photoion spectroscopy of atomic uranium in the region of 6p and 5d excitations

P. van Kampen, Ch. Gerth, M. Martins, P. K. Carroll, J. Hirsch, E. T. Kennedy, O. Meighan, J.-P. Mosnier, P. Zimmermann, and J. T. Costello
Phys. Rev. A 61, 062706 – Published 10 May 2000
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Abstract

The photoabsorption process in atomic uranium has been investigated experimentally and theoretically in the 15–150-eV region. Using the dual laser plasma technique, the 6p photoabsorption spectrum has been recorded while for the first time the 5d region has been remeasured photoelectrically using both photoabsorption and photoion spectroscopy. Interpretation of the photoabsorption spectra is supported by Hartree-Fock calculations which take into account spin-flip decay and the interaction of many discrete states with many continua. The 6p spectrum is entirely dominated by spin-orbit split 6p6d transitions. The 5d-subshell photoabsorption is shown to consist predominantly of discrete 5d5f excitations; here the electrostatic and spin-orbit interactions are comparable in strength.

  • Received 18 January 2000

DOI:https://doi.org/10.1103/PhysRevA.61.062706

©2000 American Physical Society

Authors & Affiliations

P. van Kampen1, Ch. Gerth1,2, M. Martins3, P. K. Carroll4, J. Hirsch1, E. T. Kennedy1, O. Meighan1, J.-P. Mosnier1, P. Zimmermann2, and J. T. Costello1

  • 1Centre for Laser Plasma Research, National Centre for Plasma Science and Technology, School of Physical Sciences, Dublin City University, Dublin 9, Ireland
  • 2Institut für Atomare und Analytische Physik, Hardenbergstrasse 36, Technische Universität Berlin, D-10623 Berlin, Germany
  • 3Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
  • 4Department of Experimental Physics, National University of Dublin, Belfield, Dublin 4, Ireland

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Vol. 61, Iss. 6 — June 2000

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