SciPy

darkhistory.physics.beta_ion

darkhistory.physics.beta_ion(T_rad, species)

Case-B photoionization coefficient.

Parameters:
T_rad : float

The radiation temperature.

species : {‘HI’, ‘HeI_21s’, ‘HeI_23s’}

The relevant species.

Returns:
float

Case-B photoionization coefficient in s-1.

Notes

For HeI, returns beta with respect to the 2s state, in agreement with convention in RECFAST.

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