Measurements of the electron impact ionisation cross sections of He, C, O and N atoms
Measurements of the electron impact ionisation cross sections of He, C, O and N atoms
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He、C、O 和 N 原子的电子碰撞电离截面的测量
DOI：
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发表时间：
1978
期刊：
影响因子：
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通讯作者：
A. C. Smith
中科院分区：
文献类型：
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作者：
E. Brook;M. Harrison;A. C. Smith
报道了氦、碳、氮和氧的基态原子在7到1000 eV的电子能量范围内的电子碰撞电离截面的绝对测量结果。所使用的方法是交叉光束，其中通过在气体靶中捕获2到4个质子的电荷来产生原子的快束。100 eV以上氦原子的数据与Rapp和Englander-Golden（1965）使用静态气体靶技术的绝对数据非常吻合（+或5%）。然而，目前的数据在较低能量下的量级较小。氧和氮原子的数据与早先使用热能原子束的交叉束实验的数据完全一致。
Absolute measurements are reported of the electron impact ionisation cross sections of ground-state atoms of helium, carbon, nitrogen and oxygen for electron energies ranging from 7 to 1000 eV. The method used was that of crossed beams in which fast beams of atoms are produced by charge capture of 2 to 4 keV ions in a gas target. The data for helium atoms above 100 eV are in excellent agreement (+or-5%) with the absolute data of Rapp and Englander-Golden (1965) who used a static gas target technique. However, the present data are smaller in magnitude at lower energies. Data for oxygen and nitrogen atoms are in adequate agreement with data from earlier crossed-beams experiments that employed thermal-energy atom beams.