SciPy

darkhistory.physics.photo_ion_xsec

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.

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