Is quenching of electronically excited NO2 by N2 an important atmospheric source of N2O?

E.G Estupiñán , R.E Stickel , P.H Wine
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引用次数: 7

Abstract

Context Abstract: The atmospheric budget of N2O, a greenhouse gas and the dominant source of total reactive nitrogen to the stratosphere, remains a controversial subject. Gas-phase atmospheric chemical sources of N2O are not well documented, but studies of atmospheric N2O samples show a mass-independent heavy oxygen isotope enrichment which is suggestive of the existence of missing in situ sources or sinks. We have studied N2O production from the reaction of electronically excited NO2 with N2. Contrary to earlier findings, our results show that this process is an insignificant source of atmospheric N2O.

Main Abstract: Production of N2O as a product of the collisional deactivation of electronically excited NO2 by N2 has been investigated with the goal of establishing the importance of this process in the atmospheric N2O budget. The experimental approach minimizes potential interferences from heterogeneous reactions, multiphoton processes, and self-quenching. At the 95% confidence limit, we find that the quantum yield for production of N2O from 488 nm photolysis of 60 Torr of 0.1% NO2 in N2 is less than 4 × 10−8, i.e., at least 10,000 times smaller than a previously published value; this result suggests that quenching of electronically excited NO2 by N2 is unimportant as a source of atmospheric N2O.

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N2对电子激发NO2的猝灭是N2O的重要大气来源吗
摘要:N2O是一种温室气体,也是平流层总活性氮的主要来源,其大气收支一直是一个有争议的话题。N2O的气相大气化学源没有很好的文献记载,但对大气N2O样品的研究表明,重氧同位素富集与质量无关,这表明存在缺失的原位源或汇。研究了电子激发NO2与N2反应生成N2O的方法。与先前的发现相反,我们的结果表明,这一过程是大气N2O的一个微不足道的来源。摘要:本文研究了N2电子激发NO2的碰撞失活过程中N2O的产生,目的是确定这一过程在大气N2O收支中的重要性。实验方法最大限度地减少了来自非均相反应、多光子过程和自猝灭的潜在干扰。在95%置信限下,我们发现在60 Torr、0.1% NO2的N2条件下,488nm光解生产N2O的量子产率小于4 × 10−8,即至少比先前发表的值小10,000倍;这一结果表明,作为大气N2O的来源,电子激发NO2被N2猝灭是不重要的。
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