Storage ring study of the dissociative recombination of He+2

被引：18
|
作者：
Urbain, X
Djuric, N
Safvan, CP
Jensen, MJ
Pedersen, HB
Sogaard, LV
Andersen, LH
机构：
[1] Univ Catholique Louvain, Dept Phys, B-1348 Louvain, Belgium
[2] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
[3] Univ Aarhus, Dept Phys & Astron, DK-8000 Aarhus, Denmark
来源：
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 2005年 / 38卷 / 01期
关键词：
D O I：
10.1088/0953-4075/38/1/004
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Absolute cross sections for dissociative recombination have been measured for the He-4(2)+ and (HeHe+)-He-3-He-4 isotopomers as a function of storage time at the ASTRID 2 storage ring. The recombination rate of (HeHe+)-He-3-He-4 with low-energy electrons is found to dramatically decrease with time, giving an upper limit for the thermal rate coefficient for cold ions of the order of 6 x 10(-10) cm(3) s(-1), in agreement with flowing afterglow measurements. Two-dimensional imaging of the atomic fragments points to He(1s(2) S-1) + He(1s3s S-3) as the lowest dissociation channel to be accessed in the dissociative recombination of rovibrationally hot ions.
引用
收藏
页码：43 / 50
页数：8
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