elastic collision

Also contains definition of: inelastic collision
https://doi.org/10.1351/goldbook.E01915
A particle (atom or molecule) can undergo a change in its state of excitation as a result of collisions with other particles. In an elastic collision an exchange only of @K03402@ takes place between the colliding species; in an inelastic collision there is an interchange between the @K03402@ and the @I03103@ of the particle.
Source:
PAC, 1996, 68, 149. (A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)) on page 159 [Terms] [Paper]