EINSTEIN A-COEFFICIENTS FOR TRANSITIONS AMONG THE 3S(2)3P(3) STATES OF S-II

Einstein A-coefficients for transitions among the 3s(2)3p3 states of SII, calculated with the CIV3 code, are found to be up to approximately 25% different from those of Mendoza and Zeippen. These new results are used to derive the theoretical emission line ratio R = I(3s(2)3p3 4S3/2o-3s(2)3p3 2D5/2o)/ I(3S(2)3P3 4S3/2o-3s(2)3p3 2D3/2o) = I(6717 angstrom)/I(6730 angstrom), which is a very useful electron density diagnostic for gaseous nebulae. The present diagnostics are up to approximately 10% larger than those deduced using the A-values of Mendoza and Zeippen, and will lead to electron density estimates up to approximately 50% greater.