darkhistory.physics.photo_ion_xsec¶
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darkhistory.physics.
photo_ion_xsec
(eng, species)¶ Photoionization cross section in cm2.
Cross sections for hydrogen, neutral helium and singly-ionized helium are available.
Parameters: - eng : ndarray
Energy to evaluate the cross section at.
- species : {‘HI’, ‘HeI’, ‘HeII’}
Species of interest.
Returns: - xsec : ndarray
Photoionization cross section.