Formation of fragment momentum correlations in three-body predissociation of triatomicydrogen: The interplay of geometry-dependent nonadiabatic coupling and ground-state dynamics

摘要

Momentum correlations in three-body predissociation of triatomic hydrogen are investigated by quasiclassical trajectory calculations. It is shown that nonadiabatic couplings that trigger predissociation of the 2sA_1 state of H_3 imprint their geometric properties on the momentum correlation structures observed after dissociation. A simple symmetry-based model of the geometric coupling properties succeeds in reproducing most of the experimentally observed patterns. The ground-state dynamics that transform the geometric properties of the coupling into the final momentum correlations are identified.