darkhistory.physics.coll_ion_sec_elec_spec

darkhistory.physics.coll_ion_sec_elec_spec(in_eng, eng, species=None, method='old')

Secondary electron spectrum after collisional ionization.

For ‘old’ method, See 0910.4410 –> Shull, Astrophysical Journal, 234:761-764, 1979 December 1 For ‘MEDEA’ method, see Kim Y., Rudd M. E., 1994, Phys. Rev. A, 50, 3954 OR Mon. Not. R. Astron. Soc. 422, 420–433 (2012) For ‘new’ method, TBD

Parameters:

in_eng : float

The incoming electron energy.

eng : ndarray

Abscissa of kinetic energies.

species : {‘HI’, ‘HeI’, ‘HeII’}

Species of interest.

method : {‘old’, ‘MEDEA’, ‘new’}

if method == ‘old’, see Shull, Astrophysical Journal, 234:761-764, 1979 December 1; if method == ‘MEDEA’, we follow the method used in the MEDEA code, which is the ‘old’ method; if method == ‘new’, nothing yet

Returns:

ndarray

Secondary electron spectrum. Total number of electrons = 2.

Notes

Includes both the freed and initial electrons. Conservation of energy is not enforced, but number of electrons is.