Proton emission following multiple electron capture in slow N7++HCl collisions -: art. no. 042706

被引:7
|
作者
Frémont, F
Martina, D
Kamalou, O
Sobocinski, P
Chesnel, JY
McNab, IR
Bennett, FR
机构
[1] Univ Caen, CNRS,Unite Mixte, CEA,EnsiCaen, Ctr Interdisciplinaire Rech Ions Lasers, F-14050 Caen, France
[2] Newcastle Univ, Sch Nat Sci, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
[3] CSIRO Minerals, Bentley, WA 6982, Australia
来源
PHYSICAL REVIEW A | 2005年 / 71卷 / 04期
关键词
D O I
10.1103/PhysRevA.71.042706
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Collisions between 98-keV N7+ ions and a HCl target have been investigated experimentally. The kinetic-energy distribution of fragment H+ ions originating from multiple electron capture was detected at angles in the range 20 degrees-160 degrees with respect to the incident beam direction. Proton energies as large as 100 eV were observed, and calculations made in the simple Coulomb explosion model suggest that up to seven target electrons may be involved during the collision. Using the Landau-Zener model, we show that the N7+ projectile mainly captures outer-shell electrons from HCl. From the experimental data we derived multiple-capture cross sections which we compared with results from a model calculation made using the classical over-barrier model and also with a semiempirical scaling law. For the specific case of double capture, several structures appeared, which were assigned using ab initio calculations to states of HCl2+.
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页数:9
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