Photodissociation of van der Waals complexes of iodine X-I-2 (X = I-2, C2H4) via charge-transfer state: A velocity map imaging investigation

摘要

The photodissociation of van der Waals complexes of iodine X-I-2 (X = I-2, C2H4) excited via Charge-Transfer (CT) band has been studied with the velocity map imaging technique. Photodissociation of both complexes gives rise to translationally "hot" molecular iodine I-2 via channels differing by kinetic energy and angular distribution of the recoil directions. These measured characteristics together with the analysis of the model potential energy surface for these complexes allow us to infer the back-electron-transfer (BET) in the CT state to be a source of observed photodissociation channels and to make conclusions on the location of conical intersections where the BET process takes place. The BET process is concluded to provide an