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A: Atomphysik

A 10: Posters Wednesday (Cooling and Trapping, Electron Scattering and Recombination)

A 10.38: Poster

Mittwoch, 4. April 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], Fe^q+ (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)