The User Defined subnode is available from the context menu (right-click the Collisions parent node) or from the Physics toolbar, Attributes menu. The User Defined node allows the postcollision species properties to be user defined. The inclusion of the primary particle undergoing the collision in the collision products can be controlled by this subnode. If the collision products involve additional species, their properties may be controlled by the inclusion of the Species Properties subnodes available from the context menu (right-click the Collisions parent node) or from the Physics toolbar, Attributes menu. The number of Species Properties subnodes must be equal to the number of distinct secondary species present in the collision products.

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.

Select the Release primary particle checkbox to include the primary particle in the collision products when the collision occurs.

Enter values or expressions for the Reinitialized particle velocity vr (SI unit: m/s) based on space dimension.