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        Step 1.--An initial electron density estimate N =N() is used in equation (5.8) to calculate an
 e    e
 initial cut-off quantum number n(o). The initial value of the hydrogen partition function is then calculated from (5.7). The other partition functions and constants are evaluated as described in the discussion of each of the four reaction equations.

        Step 2.--The plasma composition is calculated

using the low, intermediate,or high temperature equations, as determined by the particular values of pressure and temperature.

        Step 3.--The electron density, Ne, calculated in

Step 2 is used to recalculate nC from (5.8), which in turn gives a new value for uH using (5.7).

        Step 4.--Steps 2 and 3 are repeated r times until N (r) - N (r-l) < E:, where N (r) is the electron density
  e      e     Ie
calculated in the r-th iteration and E: is the desired convergence.

        Step 5.--The ionization potential lowering is

calculated by (4.38) and Step 2 is repeated to give the final values for the plasma composition.


Results of Hydrogen Plasma Composition Calculations

        The HPLAZ program was used to calculate the hydrogen plasma composition for pressures from 10 atm