Collision between electron and ion (The mean free path)

Description

Ionization is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons to form ions. Ionization can result from the loss of an electron after collisions with sub atomic particles, collisions with other atoms, molecules and ions, or through the interaction with light. The mean free path is the average distance travelled by a moving particle between successive impacts (collisions). The mean free path at the collision between electron and ion is depended on the radius of the ion.