darkhistory.physics.d_xe_Saha_dz¶
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darkhistory.physics.
d_xe_Saha_dz
(rs, species)¶ z-derivative of the Saha equilibrium ionization value.
Parameters: - rs : float
The redshift in 1+z.
- species : {‘singlet’, ‘triplet’}
Returns: - float
The derivative of the Saha equilibrium d xe/dz.
Notes
See astro-ph/9909275 and 1011.3758 for details.