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Recent calculations of electron impact excitation rates in helium-like Si XIII are used to derive the electron density sensitive emission line ratio R and temperature sensitive ratio G in terms of the forbidden, intercombination and resonance transitions. A comparison of these with R and G ratios measured from X-ray spectra of the DITE tokamak, for which the electron density and temperature have been well determined, reveals good agreement between theory and observation. This provides experimental support for the accuracy of the atomic data adopted in the line ratio calculations. The theoretical results may be applied to the analysis of remote sources for which no independant electron density and temperature estimates exist (such as solar flares), to derive values of these parameters which, on the basis of the above comparison between theory and observation, should be accurate to ±0.3 dex and ±0.1 dex respectively.

Additional information

Authors: KEENAN F P, Queen's University, Belfast (Northern Ireland);MCCANN S M, Queen's University, Belfast (Northern Ireland);PEACOCK N J, Culham Laboratory (GB);DUNN J, University of Leicester, Leicester (GB);BARNSLEY R, University of Leicester, Leicester (GB);EVANS K D, University of Leicester, Leicester (GB)
Bibliographic Reference: Report: CLM-P854 EN (1989)
Availability: Available from the Librarian, UKAEA, Culham Laboratory, Abingdon, Oxon. OX14 3DB (GB)
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