harpoon mechanism

https://doi.org/10.1351/goldbook.H02746
Reaction @ST06775@ (thermal or photoinduced) between neutral molecular or atomic entities in which long-range @E02011@ is followed by a considerable reduction of the distance between donor and acceptor sites as a result of the electrostatic attraction in the @I03231@ created.
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2245 [Terms] [Paper]