Collisions (`plasmapy.formulary.collisions`)

The collisions subpackage contains commonly used collisional formulae from plasma science.

Sub-Packages & Modules

`coulomb`	This module contains functionality for calculating Coulomb parameters for different configurations.
`dimensionless`	Module of dimensionless parameters related to collisions.
`frequencies`	Module of frequency parameters related to collisions.
`lengths`	Module of length parameters related to collisions.
`misc`	Module of miscellaneous parameters related to collisions.

`MaxwellianCollisionFrequencies`(...)	Compute collision frequencies between two slowly flowing Maxwellian populations.
`SingleParticleCollisionFrequencies`(...)	Compute collision frequencies between test particles (labeled 'a') and field particles (labeled 'b').

`collision_frequency`(T, n, species[, z_mean, ...])
`Coulomb_cross_section`(impact_param)	Cross-section for a large angle Coulomb collision.
`Coulomb_logarithm`(T, n_e, species[, z_mean, ...])	Compute the Coulomb logarithm.
`coupling_parameter`(T, n_e, species[, ...])	Ratio of the Coulomb energy to the kinetic (usually thermal) energy.
`fundamental_electron_collision_freq`(T_e, ...)	Average momentum relaxation rate for a slowly flowing Maxwellian distribution of electrons.
`fundamental_ion_collision_freq`(T_i, n_i, ion)	Average momentum relaxation rate for a slowly flowing Maxwellian distribution of ions.
`impact_parameter`(T, n_e, species[, z_mean, ...])	Impact parameters for classical and quantum Coulomb collision.
`impact_parameter_perp`(T, species[, V])	Distance of the closest approach for a 90° Coulomb collision.
`Knudsen_number`(characteristic_length, T, ...)	Knudsen number (dimensionless).
`mean_free_path`(T, n_e, species[, z_mean, V, ...])	Collisional mean free path (m).
`mobility`(T, n_e, species[, z_mean, V, method])	Return the electrical mobility.
`Spitzer_resistivity`(T, n, species[, z_mean, ...])	Spitzer resistivity of a plasma.