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hydrogen ion. Since H has no bound states above the ground state (52), the partition function of H is uH- =                     0 (H-) = 1               (5.30)


where g0(H-) is the statistical weight of the ground state. The partition function uH is again given by (5.7).

        4. Molecular ionization H2     2 +

equation relating the particles of the molecular ionization reaction is


          N + N      U           3/2
          H2 e        H+  2wm k          -EH /kT
                      2    ~        3/2     2
           N       2               T    e           (5.31)
           H2         H

where E   is the ionization potential of H2. The partition function of uH has been discussed in reference to the
              2
molecular dissociation reaction and is computed from (5.9) using the expressions (5.10), (5.15), and (5.26). The partition function of the molecular hydrogen ion is given by


               uH+ =    uR uV                       (5.32)
                 2
where u     UR,  are computed for H+ from expressions


analogous to the H2 relations (5.10), (5.15), and (5.26).


Basic Equations for Hydrogen Plasma

        The set of equations describing the composition of