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Volume 127, Issue 15, 21 October 2007
Product branching between reactive and nonreactive pathways in the collisional quenching of OH radicals by127(2007); http://dx.doi.org/10.1063/1.2800316View Description Hide Description
The collisional quenching of OH radicals in their excited electronic state by molecular hydrogen is examined to determine the partitioning between reactive and nonreactive pathways. This is achieved using a pump-probe laser technique to compare the population prepared in the excited OH state with that produced in the OH ground state from nonreactive quenching. Only a small fraction of the products, less than 15%, arise from nonreactive quenching; reactive quenching is the dominant product channel. The branching between the product channels provides a new dynamical signature of the conical intersection region(s) that couple the excited state potential for OH with OH and products.