Approximate LTE Concentrations of Atoms, Ions, Molecules and Molecular Ions in the Ten-element HSRA

The Harvard-Smithsonian Reference Atmosphere (HSRA) is used as a basis for determining approximate equilibrium concentrations of 51 molecular and ionic species formed by the 10 HSRA elements (H, He, O, C, Si, Fe, Mg, S, Al, Na) for each of the 95 reference levels. The departure coefficients employed by Gingerich (1971) for atomic hydrogen are included so that the ionization potential will be a function of level number. The best experimentally determined atomic and molecular weights are used for all species except FeH; for this species, crude thermodynamic functions are calculated from many-body perturbation-theory potential curves obtained by Walker et al. (1972). Level concentrations for all major and several minor species are presented in detail along with a brief evaluation of extremum trends. Column densities at optical depths ranging from zero to 3.16 are given for H2(+), 02(+), OH(+), CO(+).