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首页> 外文学位 >Metastable production from electron impact dissociation of water, deuterium oxide, and hydrogen peroxide.
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Metastable production from electron impact dissociation of water, deuterium oxide, and hydrogen peroxide.

机译：水，氘化氢和过氧化氢的电子碰撞离解产生亚稳产物。

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摘要

The present work involves an investigation of the dissociation of H 2O, D2O and H2O2 by electron impact over an incident energy range from threshold to 300eV. A pulsed electron beam, a target vapor beam, and the axes of detector were arranged to be perpendicular to each of others. By using channeltron detector, the fragments following the electron impact were probed so that the time-of-flight (TOF) spectra were obtained. In the case of H2O/D2O, significant isotopic effect was observed through comparison between TOF spectra for two targets. This isotopic shift was adopted to identify the fragments produced by dissociation of H2O (D2O). The major peak, which was thought to be due to the fragment only containing hydrogen (deuterium) element, in the TOF spectra was extracted and translated to total released kinetic energy (RKE) spectra. The excitation function for that peak was measured as well. At least three dissociation processes showed up, whose threshold were about 12.5eV, 23eV, and 58eV, respectively. In the case of H2O2, the TOF spectra were obtained, which, unfortunately, proved to be the mixture of TOF spectra for H2O and for O2. The possible reason for that is the much low vapor pressure of H2O2 relative to the vapor pressure of H2O from the 30% water solution of H 2O2. Further experiments are required to investigate the dissociation of H2O2.
机译：本工作涉及在阈值至300eV的入射能量范围内通过电子撞击对H 2O，D2O和H2O2的离解进行研究。脉冲电子束，目标蒸气束和检测器的轴相互垂直地布置。通过使用通道加速器探测器，探测了电子撞击后的碎片，从而获得了飞行时间（TOF）光谱。在H2O / D2O的情况下，通过比较两个目标的TOF光谱观察到了明显的同位素效应。采用这种同位素转移来鉴定由H2O（D2O）分解产生的片段。认为是由于TOF光谱中的主要峰仅包含氢（氘）元素而产生的主峰被提取并转化为总释放动能（RKE）谱。还测量了该峰的激发函数。出现至少三个解离过程，其阈值分别为约12.5eV，23eV和58eV。在H2O2的情况下，获得了TOF光谱，不幸的是，它证明是H2O和O2的TOF光谱的混合物。可能的原因是，相对于来自30％H 2 O 2水溶液的H 2 O蒸气压，H 2 O 2蒸气压非常低。需要进一步的实验来研究H 2 O 2的离解。

著录项

  • 作者

    Liao, Xinqing.;

  • 作者单位

    University of Windsor (Canada).;

  • 授予单位 University of Windsor (Canada).;
  • 学科 Molecular physics.
  • 学位 M.Sc.
  • 年度 2006
  • 页码 95 p.
  • 总页数 95
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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