Abstract
Electron impact excitation rates for transitions in Ni XX, calculated with the R-matrix code, are used to derive the theoretical emission line ratio R1 = I(2s22p5 2P3/2-2s22p5 2P1/2)/I(2s22p5 2P3/2-2s2p6 2S1/2) = I(694.5 Å)/I(83.2 Å) as a function of electron density for values of Ne(=1012-1015cm−3) applicable to tokamak plasmas. The results are found to be significantly different from those deduced if the electron rates of Blaha are adopted in the line ratio calculations, and will lead to electron density estimates between factors of 5 larger and 2.7 smaller for electron temperatures in the range log Te = 6.5 to 7.1. Observations of this ratio in a tokamak discharge would therefore be of great interest, not only as an experimental test of the R-matrix atomic data, but also so that the potential usefulness of R1 as an Ne-diagnostic may be fully investigated.
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