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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Quantum State Distribution of the OH X2Π Products from Collisional Quenching of OH A2Σ+ by O_2 and CO_2
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Quantum State Distribution of the OH X2Π Products from Collisional Quenching of OH A2Σ+ by O_2 and CO_2

机译：O_2和CO_2对OHA2Σ+的碰撞猝灭作用导致OHX2Π产物的量子态分布

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摘要

The OH X_2Π product state distribution arising from quenching of electronically excited OH A_2Σ+ by O_2 and CO2 under single collision conditions has been determined using a pump-probe technique. For both collision partners, the majority of OH X_2 products are observed in their lowest vibrational level, V ) 0, with significantly less population in V ) 1. The OH products from quenching by O_2 are generated with a substantial degree of rotational excitation, peaking around N" ≈ 17, with an average rotational energy of 4800 cm-1, whereas OH products from quenching by CO_2 exhibit a moderate degree of rotational excitation, peaking around N" ≈5, with an average rotational energy of 1800 cm-1. The branching fraction into OH X_2 products states reveals that nonreactive quenching is a significant decay pathway for both systems, accounting for at least 40(1)% of the quenched products with O_2 and 64(5)% with CO_2.
机译：已使用泵浦探针技术确定了在单次碰撞条件下由O_2和CO2淬灭电子激发的OHA_2Σ+引起的OHX_2Π产物状态分布。对于两个碰撞伙伴，观察到大多数的OH X_2产物处于最低振动水平V）0，而在V）1中的团聚明显减少。通过O_2淬灭而产生的OH产物具有相当大的旋转激发度，达到峰值在大约N''≈17左右，平均旋转能为4800 cm-1，而通过CO_2淬灭的OH产物表现出中等程度的旋转激发，在N“≈5附近达到峰值，平均旋转能为1800 cm-1。进入OH X_2产物状态的支化分数表明，对于两个系统，非反应性猝灭都是一条重要的衰变途径，至少占O_2猝灭产物的40（1）％和CO_2猝灭产物的64（5）％。

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