Determinations of Intermediate Neutral Species in Hydrocarbon Discharge Plasma

Determinations of Intermediate Neutral Species in Hydrocarbon Discharge Plasma
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烃类放电等离子体中中间中性物质的测定

DOI:
10.1007/s11090-010-9223-x
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发表时间:
2010-03
影响因子:
3.6
通讯作者:
--
中科院分区:
工程技术3区
文献类型:
--
作者:

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本文报道了大气压直流快流脉冲放电碳氢等离子体中中间组分的激光电离飞行时间质谱研究。所有中性中间物质,包括苯/Ar放电产生的瞬时自由基,均已通过分子束采样结合TOF质谱进行表征。这表明,在Ar放电中的0.3%C6H6的烃气体混合物的中间物种由简单的自由基(如C2,C5 H5,C7 H7)和多环有机分子(C10 H8,C13 H10,C14 H10)。采用杂化密度泛函理论对中间物种的总能量和电离势进行了理论研究。讨论了电离势对质谱强度的影响。根据观测数据,讨论了等离子体化学中可能的主要中性反应通道。该实验方法对托卡马克边缘等离子体中挥发性有机物的去除和杂质诊断具有重要意义。
This work reports laser ionization combined with Time-Of-Flight (TOF) mass spectrometry investigation on intermediate species in the hydrocarbon plasma of atmospheric-pressure fast-flow pulsed dc-discharge. All neutral intermediate species including transient radicals from benzene/Ar discharge have been characterized by a molecular beam sampling combined with TOF mass spectrometry. This shows that with a hydrocarbon gas mixture of 0.3% C6H6in Ar discharge the intermediate species consist of simple radicals (such as C2, C5H5, C7H7) and polycyclic organic molecules (C10H8, C13H10, C14H10). Theoretical studies on total energies and ionization potentials of the intermediate species have been carried out using the hybrid density functional theory. Effect of the ionization potential on mass spectral intensity has been discussed. Based on the observed data, the possible major neutral reaction channels of the plasma chemistry have been discussed. The developed experimental method has implications in volatile organic compounds removing and impurities diagnosis in Tokamak edge-plasma.
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发表时间: 1996-06
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