Equivalent-Ion Model of the Mixed Gas Discharge

Based on Boltzmann equation, we studied the mixed gas of monatomic molecules first. After that, in order to describe the ion-molecule collisions of the actual mixed gas, we developed the basic equations of actual mixed gas. But it is usually too complicated to be used to describe gas discharge. So we simplified them and changed them into the equivalent-ion modeling, which includes the positive ion equation, the electron equation, the molecule equation and Maxwell equations. Finally, by means of the equivalent-ion model, we deduced and modified Townsend model, and the results have been verified by test.