Electronic quenching of OH AΣ+2 radicals in single collision events with molecular hydrogen: Quantum state distribution of the OH XΠ2 products

摘要: We report a combined experimental and theoretical investigation of the nonreactive quenching channel resulting from electronic OH AΣ+2 by molecular hydrogen. The experiments utilize pump-probe scheme to determine XΠ2 population distribution following collisional in pulsed supersonic expansion. pump laser excites (ν′=0, N′=0), which has significantly reduced fluorescence lifetime due H2. probe monitors (ν″, N″) via laser-induced on various A-X transitions under single collision conditions. reveal high degree rotational excitation (N″) quenched products observed ν″=1 2 as well pronounced propensity for into Π(A′) Λ-doublet level. These have been supplemented extensive multireference, configuration-interaction calculations aimed at exploring topology relevant potential energy surfaces. Electronic AΣ+...