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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Initial Polymerization Reactions in Particle-Forming Ar/He/C2H2 Plasmas Studied via Quantitative Mass Spectrometry
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Initial Polymerization Reactions in Particle-Forming Ar/He/C2H2 Plasmas Studied via Quantitative Mass Spectrometry

机译：通过定量质谱研究形成颗粒的Ar / He / C2H2等离子体中的初始聚合反应

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摘要

The initial polymerization reactions in particle forming Ar/He/C2H2 plasmas are studied using molecular beam mass spectrometry(MBMS).The measured mass spectra are disentangled and quantified with the help of Bayesian probability theory.This approach uses the measured mass spectra and the cracking patterns(CPs)of the species that are formed in the plasma as the main input parameter.The CPs are either taken from calibration measurements or the NIST database or estimated based on a comparison to CPs of similar molecules.These estimated CPs are then modified by Bayesian analysis to fit the measured data.The CPs of C6H2,C6H4,and C8H2,which are not available in the NIST database,are determined in this way and can serve as good estimation until precise data is published.The temporal evolution after plasma ignition of the densities of in total 22 species(hydrocarbons,noble gases,and impurities)are quantified and expressed as partial pressures.The most abundant products in our plasma are C4H2 and C6H2 molecules with maximum partial pressures of 0.1 and 0.013 Pa,respectively.Our quantitative data can be used to validate plasma chemistry models.First comparison is made to a plasma chemistry model of similar C2H2 plasma already available in the literature.The comparison indicates that dissociative electron attachment to C_(2n)H2(n>1)molecules is a dominant source of negative ions in C2H2 plasmas.Additionally,the C2H4 has been identified as a precursor for CH4 molecules.
机译：利用分子束质谱（MBMS）研究了形成Ar / He / C2H2等离子体的初始聚合反应，借助贝叶斯概率论对测得的质谱进行纠缠和量化，该方法利用了测得的质谱和裂解在血浆中形成的物种的图案（CP）作为主要输入参数.CP可以从校准测量或NIST数据库中获取，也可以根据与相似分子的CP的比较来估算，然后通过以下方式修改这些估算的CP贝叶斯分析适合测量的数据.NIST数据库中没有的C6H2，C6H4和C8H2的CP以此方式确定，并且可以用作良好的估计，直到发布精确的数据为止。等离子点火后的时间演变量化了22种物质（碳氢化合物，稀有气体和杂质）中的总密度，并将其表示为分压。我们血浆中最丰富的产物是C4H2 a分别发现最大分压为0.1和0.013 Pa的C6H2分子。我们的定量数据可用于验证等离子体化学模型。首先与文献中已有的相似C2H2等离子体的等离子体化学模型进行比较。 C_（2n）H2（n> 1）分子的解离电子附着是C2H2等离子体中负离子的主要来源。此外，C2H4被确定为CH4分子的前体。

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