On the derivation of electron density and temperature from [S II] and [O II] line intensity ratios

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Abstract
Line intensity ratios for [S II] and [O II] due to collisional de-excitation are briefly discussed. Comparison is made between various reaction rate parameters presented by separate investigators. Included are observations of ratios obtained from the Orion nebula which experimentally confirm the reaction rates of Pradhan as best representing the observed distribution of these ratios. [O II] and [S II] contour plots are also presented, which allow effective electron temperatures and densities to be estimated from pairs of line ratios.

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