The double ionization cusp in the threshold photoelectron spectrum of helium

被引:21
|
作者
Cvejanovic, S [1 ]
Shiell, RC [1 ]
Reddish, TJ [1 ]
机构
[1] UNIV BELGRADE, INST PHYS, YU-11001 BELGRADE, YUGOSLAVIA
关键词
D O I
10.1088/0953-4075/28/23/002
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
New measurements of the zero-energy electron yield in the region of the photodouble ionization threshold in helium are presented, showing for the first time a Wannier-type cusp with a small asymmetry of the excitation/ionization wing amplitudes, similar to the electron impact results in the region of the first ionization threshold. The observed pressure dependence of the cusp amplitude asymmetry and other second-order effects are discussed in an attempt to explain the discrepancy with the earlier photoionization results of Hall et al.
引用
收藏
页码:L707 / L717
页数:11
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