STUDIES OF POST-COLLISION INTERACTIONS FOR ELECTRONS EJECTED FROM AUTOIONIZING LEVELS OF HELIUM EXCITED BY LOW-ENERGY ELECTRONS

被引:13
作者
BAXTER, JA [1 ]
COMER, J [1 ]
HICKS, PJ [1 ]
MCCONKEY, JW [1 ]
机构
[1] UNIV MANCHESTER,DEPT PHYS,SCHUSTER LAB,MANCHESTER M13 9PL,LANCASHIRE,ENGLAND
关键词
D O I
10.1088/0022-3700/12/12/021
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
The authors have measured the ejected-electron energy distributions resulting from collisions of low-energy electrons with helium atoms. Four autoionising states, (2s2)1S, (2s2p)3P, (2p2)1D and (2s2p)1P, have been studied and, at impact energies within 0.15 to 2.5 eV of the threshold for exciting the states, oscillations have been observed in the ejected-electron spectra. These can be attributed to a post-collision interaction involving the two outgoing electrons and the residual ion. The spectra of the 1S and 3P states have been fitted using a semiclassical model, giving values for the parameters describing the excitation of the autoionising states.
引用
收藏
页码:2031 / 2041
页数:11
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