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
来源：
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 1995年 / 28卷 / 23期
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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