darkhistory.physics.coll_ion_xsec¶
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darkhistory.physics.coll_ion_xsec(eng, species=None, method='old')¶ e-e collisional ionization cross section in cm2.
For the ‘old’ method, see 0906.1197. For the ‘MEDEA’ method, see Mon. Not. R. Astron. Soc. 422, 420–433 (2012). For the ‘new’ method, TBD.
Parameters: - eng : float or ndarray
Abscissa of kinetic energies.
- species : {‘HI’, ‘HeI’, ‘HeII’}
Species of interest.
- method : {‘old’, ‘MEDEA’, ‘new’}
if method == ‘old’, see 0906.1197; if method == ‘MEDEA’, see Mon. Not. R. Astron. Soc. 422, 420–433 (2012); if method == ‘new’, nothing yet
Returns: - float or ndarray
e-e collisional ionization cross section.
Notes
Returns the Arnaud and Rothenflug rate if method == ‘old’.