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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Kinetics and thermalization of hot N(S-4) atoms in the upper atmosphere
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Kinetics and thermalization of hot N(S-4) atoms in the upper atmosphere

机译：高层大气中热N（S-4）原子的动力学和热化

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The production of energetic N(S-4) atoms and their subsequent thermalisation by collisions with the ambient gas play an important role in the heat and energy balance of the thermosphere. It has been suggested that nitric oxide formation by the reaction of energetic nitrogen atoms with O-2 may account for the NO deficiency in atmospheric models at altitudes of 105-110 km. Using calculated differential scattering cross sections for thermalization of N(S-4) atoms by elastic and inelastic collisions with atmospheric bath gases, we determine the energy distribution function of N(S-4) atoms and evaluate the importance of the N(S-4)+O-2 reaction as a source of NO in the thermosphere. We show that the nonthermal component produces large increases in the effective rate coefficient at low altitudes. However, we find that at altitudes below 130 km, where the production of NO by energetic N(S-4) atoms substantially exceeds the production by the thermal N(S-4) component, there is still a larger contribution from N(D-2) atoms, whereas at higher altitudes, where the N(D-2) atom source is smaller than the N(S-4) atom source, it is the thermal component of the N(S-4) distribution that dominates. Thus the production of NO by the reactions of energetic N(S-4) atoms cannot be invoked to explain the high abundance of NO. [References: 31]
机译：高能N（S-4）原子的产生及其随后通过与环境气体的碰撞而热化，在热圈的热量和能量平衡中起着重要作用。已经提出，通过高能氮原子与O-2反应形成的一氧化氮可以解释在105-110 km高度的大气模型中的NO缺乏。使用计算得出的微分散射截面，通过与大气浴气体的弹性和非弹性碰撞使N（S-4）原子热化，我们确定N（S-4）原子的能量分布函数，并评估N（S- 4）+ O-2反应作为热层中NO的来源。我们表明，在低海拔地区，非热成分会导致有效速率系数的大幅增加。但是，我们发现，在低于130 km的海拔高度上，高能N（S-4）原子产生的NO远远超过N（S-4）热成分产生的NO，但N（D -2）原子，而在更高的高度（N（D-2）原子源小于N（S-4）原子源），则主要是N（S-4）分布的热成分。因此，不能通过高能的N（S-4）原子的反应产生NO来解释NO的高丰度。 [参考：31]

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