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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Diagnostics and Kinetic Modeling of the Ignition and the Extinction Transients of a Hollow Cathode N_2O Discharge
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Diagnostics and Kinetic Modeling of the Ignition and the Extinction Transients of a Hollow Cathode N_2O Discharge

机译：空心阴极N_2O放电点火和消光瞬态的诊断和动力学建模

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摘要

The present work describes the first experimental study of the transients involved in the turn on and off of a N_2O hollow cathode discharge until the attainment of the respective stationary states. Time-resolved Fourier transform infrared spectroscopy and quadrupole mass spectrometry with ionization by electronic impact have been used to measure the temporal evolution of the concentrations of the stable species present in the discharge N_2O, N_2, O_2, NO, and NO_2. A model based on a reduced set of kinetic equations gives a global account of the measured data; this model takes into account all the mechanisms considered in a former work (Arcos, T. et al. J. Phys. Chem. A 1998, 102, 6282) to explain the steady state of a continuous N_2O discharge but includes also additional mechanisms to which transient phenomena have proven to be much more sensitive than the stationary results. In particular, excitation of some vibrational levels of N_2O and homogeneous reactions of vibrationally excited species, as well as electron impact dissociation of the stable products of the discharge are considered. On the other hand, the partial formation of NO_2 by an heterogeneous reaction previously proposed seems to be confirmed.
机译：本工作描述了对N_2O空心阴极放电的开启和关闭直到达到各自的稳态所涉及的瞬态的首次实验研究。时间分辨傅立叶变换红外光谱和通过电子碰撞电离的四极质谱已用于测量放电N_2O，N_2，O_2，NO和NO_2中存在的稳定物质的浓度随时间的演变。一个基于简化的动力学方程组的模型给出了测量数据的整体说明;该模型考虑了以前工作中考虑的所有机理（Arcos，T.等人，J。Phys。Chem。A 1998，102，6282），用于解释连续N_2O放电的稳态，但还包括事实证明，哪种瞬态现象比平稳结果要敏感得多。特别地，考虑了N_2O的某些振动水平的激发和振动激发的物质的均相反应，以及放电的稳定产物的电子冲击解离。另一方面，似乎可以证实先前提出的非均相反应引起的NO_2的部分形成。

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