Also contains definition of: inelastic collision
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.
PAC, 1996, 68, 149. (A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)) on page 159 [Terms] [Paper]