The Resonant Charge Exchange subnode is available from the context menu (right-click the Collisions parent node) or from the Physics toolbar, Attributes menu. The Resonant Charge Exchange subnode causes particles to undergo charge exchange reactions with a background gas. Resonant charge exchange occurs between atoms of the same element or molecules of the same substance that differ in charge. The total internal energy of the particles does not change as a result of the collision. The ionized particle, neutralized particle, or both ionized and neutralized particles can be released.

See Elastic for information about the Collision Statistics and New Value of Auxiliary Dependent Variables sections.

These settings are the same as for the Elastic subnode with additional options to enter a value for the Scattering angle in the center of mass system χ (SI unit: rad, default 0) and to select one of the following from the Species to release list: Ion (the default), Neutral particle, or Ion and neutral particle.

This section is available when Neutral particle or Ion and neutral particle is selected from the Species to release list. Select an option from the Neutral properties list, which may be any Particle Properties node that has been added to the physics interface.

This section is available when Neutral particle or Ion and neutral particle is selected from the Species to release list. For each auxiliary dependent variable that is defined in the model, enter the initial value of the auxiliary dependent variable for the released neutral particle. The default value is 0.