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Issue A&A
Volume 405, Number 3, July III 2003
Page(s) 1157 - 1162
Section Celestial mechanics and astrometry
DOI http://dx.doi.org/10.1051/0004-6361:20030752



A&A 405, 1157-1162 (2003)
DOI: 10.1051/0004-6361:20030752

Experimental O VI dielectronic recombination rate coefficient and its enhancement by external electric fields

S. Böhm1, A. Müller1, S. Schippers1, W. Shi1, N. Eklöw2, R. Schuch2, H. Danared3 and N. R. Badnell4

1  Institut für Kernphysik, Universität Gießen, Leihgesterner Weg 217, 35392 Gießen, Germany
2  Stockholm University, SCFAB, Fysikum, 10691 Stockholm, Sweden
3  Manne Siegbahn Laboratory, 10405 Stockholm, Sweden
4  Department of Physics and Applied Physics, University of Strathclyde, Glasgow, G4 0NG, UK

(Received 9 October 2002 / Accepted 13 May 2003)

Abstract
The dielectronic recombination rate coefficient of $\ion{O}{vi}$ ions has been measured at the heavy ion storage ring CRYRING. The electron energy range covered all dielectronic recombination resonances attached to $\rm 2s \rightarrow 2p$ ( $\Delta n=0$) core excitations. The rate coefficient in a plasma has been derived. It is compared to theoretical data. In addition the influence of external electric fields on the dielectronic recombination has been investigated. When increasing the electric field strength to 340 V/cm the experimental recombination rate coefficient is found to increase by up to a factor of 2.


Key words: atomic data -- atomic processes -- line: formation -- plasmas -- radiation mechanisms: general

Offprint request: S. Böhm, Sebastian.G.Boehm@physik.uni-giessen.de




© ESO 2003


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