Electronic Quenching Of OH A2Σ+ Radicals In Collisions With Molecular Hydrogen

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Chemical Physics Letters


Collisional quenching of electronically excited OH A2Σ+ radicals by molecular hydrogen introduces nonradiative pathways that rapidly remove OH population from the excited state, and result in a significantly decreased fluorescence lifetime. One of these pathways is shown to lead to ground state OH X2Π products with ∼1 eV of internal excitation in both highly excited rotational levels of v = 1 and the lowest rotational levels of v = 2. This highly nonstatistical OH X2Π product distribution reflects the passage of the HO–H2system through the conical intersection regions that couple the ground and excited state surfaces.

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