Total Cross Sections for Ionization and Attachment in Gases by Electron Impact. I. Positive Ionization
Total Cross Sections for Ionization and Attachment in Gases by Electron Impact. I. Positive Ionization
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DOI：
10.1063/1.1696957
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发表时间：
1965-09
影响因子：
4.4
通讯作者：
D. Rapp;P. Englander‐Golden
中科院分区：
文献类型：
--
作者：
D. Rapp;P. Englander‐Golden
在全电离管中测量了He，Ne，Ar，Kr，H2，D2，N2，O2，CO，NO，CO2，N2 O，CH 4等气体从阈值到1000 eV的全电离截面。在C2 H4和SF6中进行了更有限的测量。非常小心，以确保电子和离子流的完整收集，并没有虚假的仪器误差。提出了一种新的测量气体相对于H2的绝对截面的方法，并利用McLeod规测量了H2的绝对截面。NO和O2的截面不能通过这种方法获得，并且对这些气体的直接McLeod-gauge读数进行近似校正。据信，用本方法得到的结果尽可能准确。很难解释不同研究者测量的横截面之间的差异。麦克劳德计量误差似乎是绝对星等差异的主要原因。
The total ionization cross sections of He, Ne, Ar, Kr, Xe, H2, D2, N2, O2, CO, NO, CO2, N2O, and CH4 have been measured from threshold to 1000 eV in a total ionization tube. More limited measurements were performed in C2H4 and SF6. Great care was taken to assure complete collection of electron and ion currents, and the absence of spurious instrumental errors. A new method was devised for obtaining absolute cross sections of gases relative to H2, and a McLeod gauge was used to obtain the absolute cross section in H2. The cross sections in NO and O2 could not be obtained by this method, and an approximate correction to direct McLeod‐gauge readings was used for these gases. It is believed that the results are as accurate as is possible with the present method. It is difficult to explain the differences found between cross sections measured by various investigators. McLeod‐gauge errors appear to account for most of the difference in absolute magnitude.