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so errors in the latter can result in large errors in the plasma composition. Results of the intermediate temperature calculations show that the species H2, H-*, and 1+ become negligible at sufficiently high temperatures. The remaining species are accounted for by considering only the atomic ionization reaction H # H  + e


For this reaction, the Saha equation, electrical neutrality condition and equation of state are

     NH+ N e    U H+ 2mk3/2 32_Hk
       N      2 u       e   / T3/2 eEH/kT          (5.64)
       NH       UH    h 2



                         NH+ = Ne                  (5.65)


               P    N-                             (5 66)
               kT    TOT    H + NH+   N e

Dividing each equation by NTOT' the scaled set of equations is


                       c3 c
                       e _ K*                      (5.67)



                       C  =c                       (5.68)
                          C=Ce


1 = C3 + 2Ce


(5.69)