Excitation of He+ to the 2 2S and 2 2P states by electron impact

被引：7
作者：
Smith, ACH
Bannister, ME
Chung, YS
Djuric, N
Dunn, GH
Neau, A
Popovic, D
Stepanovic, M
Wallbank, B
机构：
[1] UCL, Dept Phys & Astron, London WC1E 6BT, England
[2] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA
[3] Chungnam Natl Univ, Dept Phys, Taejon 305764, South Korea
[4] Univ Colorado, Joint Inst Lab Astrophys, Boulder, CO 80309 USA
[5] Univ Colorado, Natl Inst Stand & Technol, Boulder, CO 80309 USA
[6] Univ Stockholm, Dept Phys, S-11385 Stockholm, Sweden
[7] St Francis Xavier Univ, Antigonish, NS B2G 2W5, Canada
来源：
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 2001年 / 34卷 / 17期
关键词：
D O I：
10.1088/0953-4075/34/17/104
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The first absolute measurement of the cross section for excitation of a hydrogenlike ion is reported. The combined cross section for electron impact excitation of ground state He(+) to the 2 (2)S and 2 (2)P excited states has been measured in the near-threshold region from 40.08 to 41.95 eV using the JILA/ORNL merged electron-ion beams energy-loss technique. The threshold step in the cross section is measured as (8.46 +/-1.52) x 10(-18) cm(2) at 90% confidence level of total uncertainty, which is approximately 20% larger than values calculated using close-coupling and variational methods. This contrasts with the longstanding disparity of nearly a factor of two between theory and normalized experiment fur excitation to the 2 (2)S state.
引用
收藏
页码：L571 / L577
页数：7
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