Berlin 2001 – scientific programme
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A: Atomphysik
A 10: Posters Wednesday (Cooling and Trapping, Electron Scattering and Recombination)
A 10.38: Poster
Wednesday, April 4, 2001, 12:30–15:00, AT3
Experimental dielectronic recombination rate coefficients for plasma physics applications — •S. Schippers1, C. Brandau1, A. Mül ler1, G. Gwinner2, D. Schwalm2, A. Wolf2, and D.W. Savin3 — 1Institut für Kernphysik, Universität Giessen, Germany — 2Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 3Columbia University, New York, USA
One important process governing the charge balance in
plasmas is dielectronic recombination (DR).
To date, plasma modeling relies heavily on theoretical DR rates which bear
large uncertainties.
Different theories yield rate coefficients which differ from one another by
up to orders of magnitude. Here we present
benchmarking measurements of plasma DR rate coefficients for
astrophysically important C3+ [1], Feq+
(17 ≤ q ≤ 21) [2] and Ni25+ [3] ions. The rate coefficients
are presented in an easy-to-use parameterization
directly applicable to plasma modeling codes.
[1] S. Schippers et al., Astrophys. J. (submitted)
[2] D.W. Savin et al., Astrophys. J. 489, L115 (1998); Astrophys. J. Suppl. 123, 687 (1999)
[3] S. Schippers et al., Phys. Rev. A 62, 022708 (2000)