Product branching between reactive and nonreactive pathways in the collisional quenching of OH A 2Sigma+ radicals by H2 |
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Authors: | Dempsey Logan P Murray Craig Lester Marsha I |
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Affiliation: | Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA. |
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Abstract: | The collisional quenching of OH radicals in their excited A 2Sigma+ 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 A 2Sigma+ state with that produced in the OH X 2Pi 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 A 2Sigma++H2 with OH X 2Pi+H2 and H2O+H products. |
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