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首页> 美国政府科技报告 >Quenching Dynamics of Electronically Excited Hydroxyl Radicals; Final rept. 15 May 2007-30 Nov 2008
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Quenching Dynamics of Electronically Excited Hydroxyl Radicals; Final rept. 15 May 2007-30 Nov 2008

机译：电子激发羟基自由基的猝灭动力学;最终的评论。 2007年5月15日至2008年11月30日

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Collisional quenching of electronically excited OH radicals by molecular partners has been investigated over the past 25 years, principally by evaluating the quenching cross sections for partners of aeronautical, atmospheric, and/or combustion relevance. Yet little is known about the outcome of these electronic quenching events, except that they facilitate the efficient removal of OH from the excited Alpha 2sigma+ electronic state by introducing nonradiative decay pathways. Most recently, we carried out the first experimental investigation of the nonreactive decay channel with molecular hydrogen by examining the quantum state distribution of the ground state OHX2Pi products. The OHX2Pi product state distribution is highly nonstatistical, with a strongly inverted rotational distribution for v'=1, demonstrating that a significant torque is applied to OH as purely electronic energy is converted into internal excitation of the OHX2Pi products. The high degree of rotational excitation is a direct manifestation of the forces in the vicinity of the conical intersection region(s) that lead to quenching.

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