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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Nitric oxide excited under auroral conditions: Excited state densities and band emissions
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Nitric oxide excited under auroral conditions: Excited state densities and band emissions

机译：极光条件下激发的一氧化氮：激发态密度和能带发射

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Electron impact excitation of vibrational levels in the ground electronic state and nine excited electronic states in NO has been simulated for an IBC II aurora (i.e., similar to 10 kR in 3914 Angstrom radiation) in ol der to predict NO excited state number densities and band emission intensities. New integral electron impact excitation cross sections for NO were combined with a measured IBC II auroral secondary electron distribution, and the vibrational populations of 10 NO electronic states were determined under conditions of statistical equilibrium. This model predicts an extended vibrational distribution in the NO ground electronic state produced by radiative cascade from the seven higher-lying doublet excited electronic states populated by electron impact. In addition to significant energy storage in vibrational excitation of the ground electronic state, both the a (4)Pi L(2)Phi excited electronic states are predicted to have relatively high number densities because they are only weakly connected to lower electronic stales by radiative decay. Fundamental mode radiative transitions involving the lowest nine excited vibrational levels in the ground electronic state are predicted to produce infrared (IR) radiation from 5.33 to 6.05 mu m with greater intensity than any single NO electronic emission band. Fundamental mode radiative transitions within the a (4)Pi, electronic state, in the 10.08-11.37 mu m region, are predicted to have IR intensities comparable to individual electronic emission bands in the Heath and epsilon band systems. Results from this model quantitatively predict the vibrational quantum number dependence of the NO IR measurements of Espy et al. [1988]. [References: 48]
机译：对于IBC II极光（即，类似于3914埃辐射中的10 kR），可以模拟地面电子状态和NO中的九种激发电子状态的振动能级，从而预测NO激发态数的密度和能带发射强度。将新的NO积分电子碰撞激发截面与测得的IBC II极光二次电子分布相结合，并在统计平衡的条件下确定10个NO电子态的振动总体。该模型预测了由辐射级联产生的NO基态电子态的扩展振动分布，这些辐射态是由电子撞击所产生的七个更高的双重态激发电子态引起的。除了在基态电子态的振动激发中大量存储能量外，a（4）Pi L（2）Phi激发的电子态都被预测为具有较高的数密度，因为它们仅通过辐射弱地连接到较低的电子空间衰变。预测在基态电子状态下涉及最低的9个激发振动能级的基本模式辐射跃迁会产生5.33至6.05μm的红外（IR）辐射，其强度比任何单个NO电子发射带都大。预测a。（4）Pi电子态在10.08-11.37μm区域内的基本模式辐射跃迁的IR强度可与Heath和epsilon波段系统中的各个电子发射波段相媲美。该模型的结果定量地预测了Espy等人的NO IR测量的振动量子数依赖性。 [1988]。 [参考：48]

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