When in a molecular collision there is no transfer of energy among different degrees of freedom, there is said to be elastic scattering.
PAC, 1982, 54, 1533. 'Glossary of terms used in nuclear analytical chemistry (Provisional)' on page 1540 (https://doi.org/10.1351/pac198254081533)
PAC, 1996, 68, 149. 'A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)' on page 163 (https://doi.org/10.1351/pac199668010149)