This paper presents an analysis of data previously reported from a test series in the Electric Arc Shock Tube Facility for incident shocks composed of pure nitrogen. The present work focuses on the lowest velocity measured in the test (approximately 7 km/s) where both molecular and atomic radiation are significant. Analysis of the spectral data with the NEQAIR radiative transport code obtains post-shock trends in temperature and number densities of the states of N₂ and atomic N. The results suggest that chemical, and possibly thermal, equilibrium has not been obtained within the distance/time measured (about 5 cm/80 µs). In the nonequilibrium region of the shock, differences between rotational temperatures of different species are observed, as well as differences between rotational and vibrational temperatures. Population of rotational states above the dissociation limit is observed to occur over a distance of several cm. Finally, these data suggest that predissociation strongly affects the C³Π_u state of N₂, leading to a lower measured radiation than predicted. An effective average pre-dissociation rate is shown to produce reasonable agreement under quasi-steady state approximation.

本文介绍了对先前在电弧冲击管设施中针对由纯氮组成的事件冲击的一系列测试报告的数据的分析。目前的工作重点是测试中测得的最低速度（大约 7 km/s），其中分子和原子辐射都很重要。_{使用 NEQAIR 辐射传输代码分析光谱数据获得了 N 2}状态的温度和数密度的震后趋势和原子 N。结果表明，在测量的距离/时间（约 5 cm/80 µs）内尚未获得化学平衡，也可能是热平衡。在冲击的非平衡区域，观察到不同物种的旋转温度之间的差异，以及旋转和振动温度之间的差异。观察到超过解离极限的旋转状态群发生在几厘米的距离上。最后，这些数据表明预解离强烈影响N _{2的 C} ³ Π _u状态，导致测量的辐射低于预期。显示出有效的平均预解离速率在准稳态近似下产生合理的一致性。