O2(X,v=8–22) 300 K quenching rate coefficients for O2 and N2, and O2(x) vibrational distribution from 248 nm O3 photodissociation
O2(X,v=8–22) 300 K quenching rate coefficients for O2 and N2, and O2(x) vibrational distribution from 248 nm O3 photodissociation
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O2(X,v=8–22) O2 和 N2 的 300 K 淬灭速率系数，以及来自 248 nm O3 光解的 O2(x) 振动分布
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
T. Slanger
中科院分区：
文献类型：
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作者：
H. Park;T. Slanger
振动激发的氧（O ˇ 2）是在大气中通过臭氧在200-300 nm哈特莱波段的光分解产生的。有人认为，O_2的Schumann-Runge带的光激发将导致O_3的预解离和自催化产生。由此产生的大气O3的新来源，可以帮助减轻目前观测和模拟O3配置文件之间的差异。为了评估这种可能性，我们已经研究了两个关键因素的新生分布的O 2水平为248 nm的光解，附近的哈特莱带的峰值，和他们的弛豫速率系数由O2和N2。我们发现，分布延伸到v=22，接近热力学极限，在v=8附近有一个峰值。300 K猝灭速率系数已经使用级联模型进行了评估，其中假设O2的弛豫通过单量子振动-振动（V-V）和振动-平移（V-T）步骤发生。通过模拟从分布顶部向下的弛豫...
Vibrationally excited oxygen (O‡2) is produced in the atmosphere by ozone photodissociation in the 200–300 nm Hartley band. It has been suggested that photoexcitation of O‡2 in the O2 Schumann–Runge bands will lead to predissociation, and autocatalytic production of O3. The resultant new source of atmospheric O3 could help alleviate current discrepancies between observed and modeled O3 profiles. To evaluate this possibility, we have examined two critical factors—the nascent distribution of O‡2 levels for 248 nm photodissociation, near the peak of the Hartley band, and the rate coefficients for their relaxation by O2 and N2. We find that the distribution extends to v=22, close to the thermodynamic limit, with a peak near v=8. The 300 K quenching rate coefficients have been evaluated using a cascade model, in which it is assumed that relaxation by O2 occurs through single‐quantum vibration–vibration (V–V) and vibration–translation (V–T) steps. By modeling the relaxation from the top of the distribution down...