A Gaussian and Slater orbital study of fine structure in the X 3Σ− and A 3Π states of NH, OH+, PH, and SH+

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Abstract
The fine structure constants λ and C0 for the X 3Σ− and A 3Π states of the NH, OH+, PH, and SH+ molecules have been calculated with double‐zeta Slater and Gaussian basis functions using single configuration wavefunctions. The spin–spin and spin–orbit matrix elements computed with the different basis functions are found to agree better than 5% in most cases. Effects of increased nuclear charge on the various fine structure parameters are compared between the neutral and positive ion, and between the first‐ and second‐row molecules.