Dielectronic recombination of Ni-like ions through the 3d94lnl′ (n′=4,5) Cu-like configurations

E. Behar, P. Mandelbaum, J. L. Schwob, A. Bar-Shalom, J. Oreg, and W. H. Goldstein
Phys. Rev. A 52, 3770 – Published 1 November 1995
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Abstract

Ab initio calculations of the rate coefficients for dielectronic recombination (DR) of ten ions along the Ni i isoelectronic sequence in the ground state (Mo14+, Ag19+, Xe26+, Pr31+, Gd36+, Dy38+, Ta45+, Au51+, At57+, and U64+) through the Cu-like 3d94lnl′ (n′=4,5) inner-shell excited configurations were performed using the hullac code package. Resonant and nonresonant radiative stabilizing transitions and decays to autoionizing levels followed by radiative cascades are included. Collisional transitions following electron capture are neglected. Nonresonant stabilizing transitions are found to enhance the DR rates, and may even dominate the process at low electron temperature. The remarkable difference between the isoelectronic trend of the rate coefficients for DR through 3d94l4l′ and through 3d94l5l′ is emphasized. The trend of DR through 3d94l4l′ shows irregularities at relatively low temperature due to the progressive closing of DR channels as Z increases. Thus, the DR coefficients cannot be reproduced or interpolated by a simple analytical formula. Even for the smooth contributions of the 3d94l5l′ configurations, a simplified model using configuration averaging for autoionization and radiative decays instead of level-by-level detailed computations is found to overestimate the DR rates by a factor of up to 2.

  • Received 18 April 1995

DOI:https://doi.org/10.1103/PhysRevA.52.3770

©1995 American Physical Society

Authors & Affiliations

E. Behar, P. Mandelbaum, and J. L. Schwob

  • Racah Institute of Physics, The Hebrew University, 91904 Jerusalem, Israel

A. Bar-Shalom and J. Oreg

  • Nuclear Research Center–Negev, P.O. Box 9001, 84190 Beer-Sheva, Israel

W. H. Goldstein

  • Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550

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Vol. 52, Iss. 5 — November 1995

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