Vacuum ultraviolet studies of electron impact of helium Excitation of He n1P0 Rydberg series and ionization-excitation of He(+) nl Rydberg series
Vacuum ultraviolet studies of electron impact of helium Excitation of He n1P0 Rydberg series and ionization-excitation of He(+) nl Rydberg series
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氦电子撞击的真空紫外研究 He n1P0 里德伯系列的激发和 He( ) nl 里德伯系列的电离激发
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
B. Franklin
中科院分区：
文献类型：
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作者：
D. Shemansky;D. Hall;J. Ajello;B. Franklin
实验测量了n=2，3，4的He-Rydberg系列(1SS S-1Snp P)的电子激发发射截面。计算截面的方法有两种：(1)用H-Ly解离激发标准分析在绝对尺度上校准的实验室光谱；(2)用修正的Born近似分析相对截面数据。发展了一种应用Bethe-Born近似的新方法，该方法利用实验的相对激发函数，在确定绝对截面时不需要在Fano图中进行外推。当考虑到级联跃迁时，两种方法对于58.4 nm谱线的一致性在3%以内。我们发现，已发表的电离-激发碰撞双电子过程的实验测量结果表明，n=2，3，4电子碰撞过程在200 eV处的直接激发截面基本一致，特别是在激发函数的能量依赖关系上，但与理论计算有显著差异。
Laboratory measurements of the electron excitation cross sections of emission in the He Rydberg series (1sS S-1snp P) for n = 2,3,4 have been obtained. The cross sections were estimated by two methods: (1) analysis of calibrated laboratory spectra placed on an absolute scale using the H Ly dissociative excitation standard and (2) analysis of relative cross section data using a modified Born approximation. A new method has been developed for the application of the Bethe-Born approximation using experimental relative excitation functions that does not require extrapolation in a Fano plot in the determination of the absolute cross section. The two methods agree to within 3% for the 58.4 nm line when allowance is made for cascade transitions. We find the direct excitation cross sections at 200 eV for the n = 2,3,4 members of the published electron impact experimental measurements of the two electron process of ionization-excitation impact are generally in agreement, especially on the energy dependence of excitation functions, but show significant differences with theoretical calculations.