| 刘伟,刘佳宏,李雪春.C 4H 2等离子体放电产生的中性碳氢团簇(C \%n\%H \%m\%)分子束质谱表征[J].,2012,(6):799-802 |
| C 4H 2等离子体放电产生的中性碳氢团簇(C \%n\%H \%m\%)分子束质谱表征 |
| Characterization of neutral hydrocarbon clusters (C \%n\%H \%m\%) from C 4H 2 plasma discharge by molecular-beam mass spectrometry |
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| DOI：10.7511/dllgxb201206004 |
| 中文关键词: C 4H 2 等离子体放电 碳氢团簇 激光电离 分子束飞行时间质谱 |
| 英文关键词: C 4H 2 plasma discharge hydrocarbon clusters laser ionization molecular-beam time-of-flight mass spectrometry |
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| 中文摘要: |
| 利用分子束飞行时间质谱和激光电离技术研究C 4H 2等离子体放电过程产生的中性碳氢团簇(C \%n\%H \%m\%)的质谱分布、稳定结构和形成机理．实验结果显示,碳氢团簇的质谱峰分布与其所含碳原子的个数有关,当碳原子的个数小于等于8时,偶数碳的碳氢团簇由于共轭效应的影响,其稳定性和质谱峰的强度均大于奇数碳的碳氢团簇；当碳原子的个数大于等于9时,出现偶数和奇数碳氢团簇的相间分布,奇数碳的碳氢团簇的质谱峰强度大于与其相邻的两个偶数碳的碳氢团簇的；当碳原子的个数为6、8、9 15、17时,C \%n\%H 3出现较强的质谱峰,这与其具有较低电离能有关．随着碳原子个数的增加,碳氢团簇质谱峰的强度总体呈现减弱趋势,这说明碳氢团簇的形成机理可能以碳原子分步加成为主． |
| 英文摘要: |
| The mass spectrometric distribution, stable structure and the synthesis mechanism of neutral hydrocarbon clusters (C \%n\%H \%m\%) from C 4H 2 plasma discharge are studied by molecular-beam time-of-flight mass spectrometry and laser ionization technology. The experimental results show that the distribution of mass spectrometric peaks is dependent on the number of carbon (n) of C \%n\%H \%m\%. When \%n\%≤8, the peak signals strength and stability with the even-\%n\% groups are stronger than those of odd-\%n\% groups due to conjugative effect. The alternation of C \%n\%H \%m\% peak signals with even/odd \%n\% groups appears for \%n\%≥9 with the odd-\%n\% groups having stronger signals. When \%n\%=6,8,9-15,17, stronger abundant clusters are C \%n\%H 3 due to their low ionization potentials. The C \%n\%H \%m\% mass spectrometric signals generally become weak with increasing \%n\%, which indicates the synthesis mechanism is mainly based on a step-addition approach. |
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