MECHANISMS FOR THE FORMATION OF IONS IN FLAMES
MECHANISMS FOR THE FORMATION OF IONS IN FLAMES
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DOI：
10.1016/0010-2180(57)90001-9
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发表时间：
1957-01-01
影响因子：
4.4
通讯作者：
CALCOTE, HF
中科院分区：
文献类型：
--
作者：
CALCOTE, HF
综述了我们对火焰中离子形成机理的认识现状，包括对文献的回顾，以及对累积和化学电离的一些新的建议。在燃烧区观察到的高离子浓度不能用杂质的热电离、火焰温度下存在的平衡物种或非平衡物种的热电离来解释。碳粒子的电离可能解释了高温碳氢化合物火焰中的离子，但实验证据很少。这种解释对稀薄混合物中的火焰不能令人满意。通过平移能或简单地延伸玻尔兹曼曲线的高能尾部进行电离太慢了。除了以热电离为主的高温火焰外，最可能的机制是ASCO(1II)+C2(1σ2+)→CO(1σ+)+C2++e−等过程的累积激发或ASCO(3II)+C2(1σ2+)→CO(1σ+)+C2++e−等过程的化学电离。这一领域最关键的问题是离子的实际识别。
The status of our understanding of the-mechanisms of ion formation in flames is summarized, including not only a review of the literature but also some new proposals on cumulative and chemi-ionization. The high observed concentrations of ions in the combustion zone cannot be accounted for by thermal ionization of impurities, of equilibrium species existing at the flame temperature, or of non-equilibrium species. Ionization of carbon particles may account for the ions in high temperature-rich hydrocarbon flames, but experimental evidence is poor. This explanation is unsatisfactory for flames in lean mixtures. Ionization via translational energy or a simple extension of the high-energy tail of the Boltzmann curve is too slow. The most probable mechanism except for high temperature flames where thermal ionization predominates is cumulative excitation by processes such asCO(1II)+C2(1σ2+)→CO(1σ+)+C2++e−or chemi-ionization by processes such asCO(3II)+C2(1σ2+)→CO(1σ+)+C2++e−The most critical problem in this field is the actual identification of the ion.