PHYS 33 |
| The collisional quenching of OH A 2Σ+ radicals by H2 is examined to determine the nascent OH X 2Π product distribution from nonreactive quenching as well as the partitioning between nonreactive and reactive pathways. The OH X 2Π vibrational distribution peaks in v″=0 and decreases monotonically with increasing vibrational excitation. The OH X 2Π products are found to be highly rotationally excited with a marked propensity for production of OH Π(A′) λ-doublet levels. A comparison of the population prepared in the excited OH A 2Σ+ state with that produced in the OH X 2Π ground state reveals that only a small fraction of the products, less than 15%, arise from non-reactive quenching. These observations are interpreted as new dynamical signatures of passage through seams of conical intersection that couple the excited state potential for OH A 2Σ+ + H2 with OH X 2Π + H2 and H2O + H products. |
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Electronic Structure and Reaction Dynamics of Open-shell Species
8:00 AM-12:05 PM, Sunday, April 6, 2008 Morial Convention Center -- Rm. 345, Oral
Division of Physical Chemistry |