Reactive resonance and the role of electron angular momentum

Understanding the reaction mechanism at the atomic and molecular level is a central task of chemistry.Within the Born-Oppenheimer approximation,a chemical reaction is envisioned as nuclear dynamics evolving from reactants to products on a potential energy surface(PES).To reveal the detailed mechanistic origin of such an old bond-breaking and new bond-forming process,a measurement of state-to-state differential cross-sections(DCSs)is essential.Its fine structure often serves as a fingerprint to identify quantum dynamics phenomena in a bimolecular reactive encounter.Observation of these fine structures is,however,difficult,because the interference feature may appear in the state-to-state DCSs only with very high angular resolution。