INDIRECT CONTRIBUTIONS TO ELECTRON-IMPACT IONIZATION OF KR-24+, KR-25+, AND XE-43+

被引：22
作者：
CHEN, MH
REED, KJ
机构：
[1] High Temperature Physics Division, Lawrence Livermore National Laboratory, Livermore
来源：
PHYSICAL REVIEW A | 1993年 / 47卷 / 03期
关键词：
D O I：
10.1103/PhysRevA.47.1874
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Electron-impact ionization cross sections have been calculated for Kr24+ and Kr25+. The contributions of excitation-autoionization and resonant excitation double autoionization (REDA) were included in addition to the cross sections for direct ionization of a 3s electron. For Xe43+ the REDA contributions were extended to two times the ionization threshold. The calculations were performed using the relativistic distorted-wave and the multiconfiguration Dirac-Fock methods. For Kr25+ the indirect processes enhance the ionization cross section by a factor of 4. For Kr24+ the total cross section is about 3.5 times the direct-ionization cross section. The REDA process produces numerous strong resonances and contributes about 20% to the average ionization cross section for Kr24+ and Kr25+ and 15% to the average ionization cross section for Xe43+.
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收藏
页码：1874 / 1877
页数：4
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