• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Time-Resolved Molecular Beam Mass Spectrometry of the Initial Stage of Particle Formation in an Ar/He/C2H2 Plasma
【24h】

Time-Resolved Molecular Beam Mass Spectrometry of the Initial Stage of Particle Formation in an Ar/He/C2H2 Plasma

机译：Ar / He / C2H2等离子体中粒子形成初始阶段的时间分辨分子束质谱

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The temporal evolution of the neutral plasma chemistry products in a capacitively coupled plasma from argon/ helium/acetylene is followed via molecular beam mass spectrometry with a time resolution of 100 ms. Several chemistry pathways are resolved. (i) The formation of C_(2n)H2 (n = 2-5) molecules proceeds via the following sequence: the production of highly reactive C2H radicals in electron impact dissociation of C2H2 is followed by C2H induced chain polymerization of C_(2n)H2 (n = 1-4). (ii) CnH4 (n = 4, 5, 6) compounds are detected already at an early stage of the discharge excluding polymerization reactions with C2H radical being responsible for their formation. Instead, vinylidene reactions with acetylene or mutual neutralization reactions of ionic species are proposed as sources of their formation. (iii) Surface reactions are identified as the source of C8H6. The measured hydrocarbon molecules represents possible precursors for negative ion formation via dissociative electron attachment reactions and can hence play a crucial role in particle nucleation. On the basis of the comparison of our data with available experimental and modeling results for acetylene plasmas in the literature, we propose C_(2n)H2 (n > 1) molecules as important precursors for negative ion formation.
机译：通过分子束质谱以100毫秒的时间分辨率跟踪氩气/氦气/乙炔在电容耦合等离子体中中性等离子体化学产物的时间演变。解决了几种化学途径。 （i）C_（2n）H2（n = 2-5）分子的形成按以下顺序进行：在C2H2的电子碰撞解离中产生高反应性C2H自由基，然后由C2H诱导C_（2n）的链聚合H2（n = 1-4）。 （ii）CnH4（n = 4、5、6）化合物已经在放电的早期阶段被检测到，不包括聚合反应，其中C2H自由基是造成它们形成的原因。相反，提出亚乙烯基与乙炔的反应或离子物质的相互中和反应作为其形成的来源。 （iii）表面反应被确定为C8H6的来源。测得的烃分子代表了通过离解电子附着反应形成负离子的可能前体，因此可以在颗粒成核中发挥关键作用。根据我们的数据与文献中乙炔等离子体的可用实验和建模结果进行比较，我们提出C_（2n）H2（n> 1）分子作为负离子形成的重要前体。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号