Electron-impact ionization of NH3 and ND3
Electron-impact ionization of NH3 and ND3
复制标题
NH3 和 ND3 的电子轰击电离
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
R. Stebbings
中科院分区：
文献类型：
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作者：
R. Rejoub;B. Lindsay;R. Stebbings
报道了从阈值到1000 eV电子能量范围内NH3和Nd3电子碰撞电离的绝对部分截面和总截面。使用飞行时间质谱仪对产物离子进行质量分析，并用位置灵敏探测器进行检测，其输出表明，所有产物离子物种都以相同的效率收集，而与它们的初始动能无关。给出了从NH3生产(NH3++NH2++NH++N+)、H+、H2+和NH32+，从Nd3生产Nd3+、Nd2+、Nd2+、N+、D+、D2+和Nd32+的数据，以及这些部分截面的总和。还给出了(ND+，D+)和(N+，D+)离子对的形成数据。大多数单电荷离子的绝对截面总的不确定度为±6-8%，而双电荷离子的绝对截面总不确定度为±20%。结果表明，氨靶的同位素组成对截面没有明显的影响，而部分氨靶的化学成分对截面没有明显影响。
Absolute partial and total cross sections for electron-impact ionization of NH3 and ND3 are reported for electron energies from threshold to 1000 eV. The product ions are mass analyzed using a time-of-flight mass spectrometer and detected with a position-sensitive detector whose output demonstrates that all product ion species are collected with equal efficiency irrespective of their initial kinetic energies. Data are presented for the production of (NH3++NH2++NH++N+), H+, H2+, and NH32+ from NH3 and for production of ND3+, ND2+, ND+, N+, D+, D2+, and ND32+ from ND3 and for the total cross sections which are obtained as the sum of these partial cross sections. Data are also presented for formation of (ND+,D+) and (N+,D+) ion pairs. The overall uncertainty in the absolute cross sections for most of the singly charged ions is ±6–8% while that for doubly charged ions is ±20%. It is observed that the isotopic composition of the ammonia target has no discernible effect upon the cross sections and that the part...