Universal shape function for the double ionization cross section of negative ions by electron impact

Details Universal shape function for the double ionization cross section of negative ions by electron impact Universal shape function for the double ionization cross section of negative ions by electron impact

1999-04-16

arxiv.org/abs/physics/9904032v1

J. Phys. B 32, L547 (1999)

Physics

Atomic Physics

4 pages, 3 figures

Scientific paper

10.1088/0953-4075/32/15/107

It is shown that recently measured cross sections for double ionization of negative ions ($H^-, O^-$, and $C^-$) possess a universal shape when plotted in suitable dimensionless units. The shape can be represented with a simple analytical function, following the same principles as it has been done in establishing a universal shape function for single ionization [Rost and Pattard 1997 Phys. Rev. A {\bf 55} R5]. Thereby, it is demonstrated that direct double ionization dominates the cross section for the targets considered.

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