Role of elastic projectile-electron scattering in double ionization of helium by fast proton impact

被引：21

作者：

Schulz, M. ^{[1
,2
]}

Ciappina, M. F. ^{[3
]}

Kirchner, T. ^{[4
]}

Fischer, D. ^{[5
,6
]}

Moshammer, R. ^{[5
]}

Ullrich, J. ^{[5
]}

机构：

[1] Missouri Univ Sci & Technol, Dept Phys, Rolla, MO 65409 USA

[2] Missouri Univ Sci & Technol, Lab Atom Mol & Opt Res, Rolla, MO 65409 USA

[3] Inst High Performance Comp, Singapore 138632, Singapore

[4] Tech Univ Clausthal, Inst Theoret Phys, D-38678 Clausthal Zellerfeld, Germany

[5] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany

[6] GSI Helmholtzzentrum Schwerionenforsch GmbH, Extreme Matter Inst EMMI, D-64291 Darmstadt, Germany

来源：

PHYSICAL REVIEW A | 2009年 / 79卷 / 04期

基金：

美国国家科学基金会;

关键词：

atom-electron collisions; electron correlations; electron impact ionisation; helium neutral atoms; DOUBLE PHOTOIONIZATION; CROSS-SECTIONS; SINGLE; EXCITATION; BREAKUP;

D O I：

10.1103/PhysRevA.79.042708

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We present a systematic study of atomic four-body fragmentation dynamics. To this end we have measured a variety of multiple differential double ionization cross sections for 6 MeV p+He collisions. The data are compared to a first-order calculation with correlated electrons and to a simulation representing a second-order process, with some experimental results seemingly in favor of the first, others in agreement with the second approach. This apparent conflict can be resolved by accounting for elastic scattering between the projectile and one electron already promoted to the continuum through electron-electron correlation in the first-order process.

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页数：7

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