Measurement of the absolute photoionization cross section of C+ near threshold

被引：61
|
作者：
Kjeldsen, H [1 ]
Folkmann, F
Hansen, JE
Knudsen, H
Rasmussen, MS
West, JB
Andersen, T
机构：
[1] Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark
[2] Univ Amsterdam, Dept Phys & Astron, NL-1018 XE Amsterdam, Netherlands
[3] SERC, Daresbury Lab, Warrington WA4 4AD, Cheshire, England
来源：
ASTROPHYSICAL JOURNAL | 1999年 / 524卷 / 02期
关键词：
atomic data; atomic processes;
D O I：
10.1086/312319
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The absolute photoionization cross section of the ground-state C+ ion has been measured from the ionization threshold at 24 eV to 31 eV using a merged ion-photon beam setup with synchrotron radiation from an undulator. The experimental results have been compared with nonrelativistic theoretical data from the Iron Project and the agreement is generally good in the near-threshold region, but differences in the magnitude of the continuum cross section of 15%-35% at higher energies and several deviations in the resonance structure are observed. The present measurements are a part of an experimental program to test the extensive theoretical photoionization cross section calculations performed within the framework of the Opacity Project and the Iron Project.
引用
收藏
页码：L143 / L146
页数：4
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