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Title: Absolute cross-section measurements for electron-impact ionization of Na-like ions: Mg/sup +/, Al/sup 2 +/, and Si/sup 3 +/

Abstract

Measured cross sections for single ionization of Mg/sup +/, Al/sup 2 +/, and Si/sup 3 +/ by electron impact are reported. Crossed beams of electrons and ions have been employed to study the absolute cross sections as a function of collision energy in detail. Near threshold the cross sections for Mg/sup +/ and Al/sup 2 +/ are roughly 70% of the predicted direct-ionization cross sections, while Si/sup 3 +/ is in reasonable agreement with the predictions. Contributions to the total cross section by indirect processes, principally inner-shell-excitation autoionization, are specifically identified in each case and compared with theoretical results. These comparisons demonstrate specific failures of the predictions which rely on additional excitation cross sections to the direct-ionization cross section.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
OSTI Identifier:
5541840
Resource Type:
Journal Article
Journal Name:
Phys. Rev. A; (United States)
Additional Journal Information:
Journal Volume: 25:1
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ALUMINIUM IONS; ELECTRON-ION COLLISIONS; IONIZATION; MAGNESIUM IONS; SILICON IONS; AUTOIONIZATION; COLLIDING BEAMS; CROSS SECTIONS; ENERGY DEPENDENCE; EXPERIMENTAL DATA; BEAMS; CHARGED PARTICLES; COLLISIONS; DATA; ELECTRON COLLISIONS; INFORMATION; ION COLLISIONS; IONS; NUMERICAL DATA; 640304* - Atomic, Molecular & Chemical Physics- Collision Phenomena

Citation Formats

Crandall, D H, Phaneuf, R A, Falk, R A, Belic, D S, and Dunn, G H. Absolute cross-section measurements for electron-impact ionization of Na-like ions: Mg/sup +/, Al/sup 2 +/, and Si/sup 3 +/. United States: N. p., 1982. Web. doi:10.1103/PhysRevA.25.143.
Crandall, D H, Phaneuf, R A, Falk, R A, Belic, D S, & Dunn, G H. Absolute cross-section measurements for electron-impact ionization of Na-like ions: Mg/sup +/, Al/sup 2 +/, and Si/sup 3 +/. United States. doi:10.1103/PhysRevA.25.143.
Crandall, D H, Phaneuf, R A, Falk, R A, Belic, D S, and Dunn, G H. Fri . "Absolute cross-section measurements for electron-impact ionization of Na-like ions: Mg/sup +/, Al/sup 2 +/, and Si/sup 3 +/". United States. doi:10.1103/PhysRevA.25.143.
@article{osti_5541840,
title = {Absolute cross-section measurements for electron-impact ionization of Na-like ions: Mg/sup +/, Al/sup 2 +/, and Si/sup 3 +/},
author = {Crandall, D H and Phaneuf, R A and Falk, R A and Belic, D S and Dunn, G H},
abstractNote = {Measured cross sections for single ionization of Mg/sup +/, Al/sup 2 +/, and Si/sup 3 +/ by electron impact are reported. Crossed beams of electrons and ions have been employed to study the absolute cross sections as a function of collision energy in detail. Near threshold the cross sections for Mg/sup +/ and Al/sup 2 +/ are roughly 70% of the predicted direct-ionization cross sections, while Si/sup 3 +/ is in reasonable agreement with the predictions. Contributions to the total cross section by indirect processes, principally inner-shell-excitation autoionization, are specifically identified in each case and compared with theoretical results. These comparisons demonstrate specific failures of the predictions which rely on additional excitation cross sections to the direct-ionization cross section.},
doi = {10.1103/PhysRevA.25.143},
journal = {Phys. Rev. A; (United States)},
number = ,
volume = 25:1,
place = {United States},
year = {1982},
month = {1}
}