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Free-electron fraction during hydrogen--helium recombination

With singly ionized helium and helium mass fraction

Y_{p}

, charge neutrality gives

\frac{n _{e}}{n _{B}} = (1 - Y_{p}) X_{H^{+}} + \frac{Y _{p}}{4} X_{H e^{+}} .

Table of contents 38 2
- Coupled hydrogen--helium Saha equations Free-electron fraction during hydrogen--helium recombination 23 1
  - Hydrogen-only Saha equation Coupled hydrogen--helium Saha equations 11

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