Theoretical electron density and temperature sensitive emission line ratios for helium-like Si XIII compared to dite tokamak observations

New calculations of the electron density sensitive emission line ratio R and temperature sensitive ratio G in helium-like Si XIII are presented. 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 excellent agreement between theory and observation, with discrepancies of typically less than 10%. This provides experimental support for the accuracy of the atomic data adopted in the line ratio calculations. The theoretical results may therefore be applied with confidence to the analysis of remote sources for which no independant electron density and temperature estimates exist, such as solar flares