ABSORPTION COEFFICIENTS FOR HYDROGEN .I. COMPOSITION

Tables and graphs of the number densities of H, H+, e-, H2, H-, H2+, and H3+ in a hydrogen gas or plasma in thermodynamic equilibrium were computed for temperatures from 300 to 40 000°K and pressure from 1.013 × 105 N/m2 (1 atm) to 1.013 × 108 N/m2 (1000 atm) except for a small, high-density region. For temperatures above 2000°K, the Debye-Hückel approximation was employed. The ion H3+ had not been included in previous calculations and was found to cause large increases in e- and H- number densities at small degrees of ionizatio. In computing the H2+ and H2 partition functions, use was made of complete tables of rotational term values for the ground electronic states. The rotational term value table for H2 is included. The relative positions of H2 singlet and triplet states were redetermined. Morse potentials are given for all singly excited attractive states of H2 with principal quantum number up to 17. The results in this paper are believed to be the most accurate available. © 1969.