EDP Sciences
Free access
Volume 409, Number 2, October II 2003
Page(s) 781 - 786
Section Celestial mechanics and astrometry
DOI http://dx.doi.org/10.1051/0004-6361:20031100

A&A 409, 781-786 (2003)
DOI: 10.1051/0004-6361:20031100

Determination of the $\ion{Ni}{xviii}$ plasma recombination rate coefficient

M. Fogle1, N. R. Badnell2, N. Eklöw1, T. Mohamed1 and R. Schuch1

1  Department of Atomic Physics, Stockholm University, SE106 91 Stockholm, Sweden
2  Department of Physics, University of Strathclyde, Glasgow G4 0NG, UK

(Received 18 March 2003 / Accepted 11 July 2003)

The absolute radiative and dielectronic recombination rate coefficients for $\ion{Ni}{xviii}$ were measured at the CRYRING storage ring for the center-of-mass energy range 0-43 eV, which covers all $\Delta n=0$ core excitations up to the 3p 1/2 and 3p 3/2 series limits. These are compared to an AUTOSTRUCTURE intermediate coupling calculation. The absolute rate coefficients are then convoluted with a Maxwellian temperature distribution to obtain the temperature dependent plasma recombination rate coefficient for the temperature range 103- 107 K. The temperature dependent rate coefficient can be useful as a tool in both astrophysical and laboratory plasma diagnostics where the knowledge of ionization balance and level populations are of interest in deciphering the many emission lines observed and for the evaluation of the plasma temperature via emission line ratios.

Key words: atomic data

Offprint request: R. Schuch, schuch@physto.se

© ESO 2003