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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Ion chemistry in cold plasmas of H-2 with CH4 and N-2
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Ion chemistry in cold plasmas of H-2 with CH4 and N-2

机译：H-2与CH4和N-2的冷等离子体中的离子化学

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摘要

The distributions of ions and neutrals in low-pressure (approximate to 10(-2) mbar) DC discharges of pure hydrogen and hydrogen with small admixtures (5%) of CH4 and N-2 have been determined by mass spectrometry. Besides the mentioned plasma precursors, appreciable amounts of NH3 and C2Hx hydrocarbons, probably mostly from wall reactions, are detected in the gas phase. Primary ions, formed by electron impact in the glow region, undergo a series of charge transfer and reactive collisions that determine the ultimate ion distribution in the various plasmas. A comparison of the ion mass spectra for the different mixtures, taking into account the mass spectra of neutrals, provides interesting information on the key reactions among ions. The prevalent ion is H-3(+) in all cases, and the ion chemistry is dominated by protonation reactions of this ion and some of its derivatives. Besides the purely hydrogenic ions, N2H+, NH4+, and CH5+ are found in significant amounts. The only mixed C/N ion clearly identified is protonated acetonitrile C2H4N+. The results suggest that very little HCN is formed in the plasmas under study.
机译：已通过质谱法确定了纯氢气和含少量CH4和N-2的少量混合物（5％）的低压氢气（约10（-2）mbar）直流放电中的离子和中性离子的分布。除了提到的等离子体前体，在气相中还检测到相当数量的NH3和C2Hx碳氢化合物，可能主要来自壁反应。由电子在辉光区域中的撞击形成的初级离子会经历一系列电荷转移和反应性碰撞，这些碰撞和碰撞决定了各种等离子体中的最终离子分布。考虑到中性离子的质谱，对不同混合物的离子质谱进行比较，可以提供有关离子间关键反应的有趣信息。在所有情况下，普遍的离子为H-3（+），并且该离子及其某些衍生物的质子化反应主导着离子化学。除了纯氢离子外，还发现大量N2H +，NH4 +和CH5 +。唯一明确识别的混合C / N离子是质子化乙腈C2H4N +。结果表明在所研究的血浆中几乎没有HCN形成。

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