A screened hydrogenic model with fine structure splitting

A method of deriving screening constants from analytic wave functions is described. These are used in a screened hydrogenic model to calculate total configuration binding energies from which spectral line energies are derived for comparison with other simulations and experiment. With no further adjustment the ab initio screening constants are seen to give predictions of greater accuracy than other screened hydrogenic models. Unlike most other screened hydrogenic models the total configuration energies include fine structure splitting.