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                         5

                    R =     d (6.32)
                         13
                         SCi


Let the specified value of the mixing ratio be R.  This value is used to determine the proper value of Ce using (6.32). An initial estimate of the electron concentration, C(O), is used to calculate H, a, $, and y from (6.25),
e
(6.28), (6.29), and (6.30). The d3(C(o)) is evaluated by (6.31) and the other di(C(o)) and Cie(C°)) are calculated as described in the preceding paragraph. The initial value of the mixing ratio is calculated from (6.32) as

                          5 di(CeC°)

                 R(0) = i=l                        (6.33)

                        i=l

If     - R()   > cC(O) is incremented by some AC     and

                      e                            e

the calculation is repeated r times until Rs - R(r) I < 641 where 64 is the convergence criterion. The di, Ci, and Ce values after r iterations constitute the proper mixed plasma composition as determined by the specified pressure, temperature, and mixing ratio.