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Title: Absolute-cross-section measurements for electron-impact ionization of triply charged inert-gas ions: Ne/sup 3 +/, Ar/sup 3 +/, Kr/sup 3 +/, and Xe/sup 3 +/

Abstract

Electron-ion crossed beams have been employed to obtain absolute cross sections for single ionization of Ne/sup 3 +/, Ar/sup 3 +/, Kr/sup 3 +/, and Xe/sup 3 +/. These data reveal a steady progression from excellent agreement with theory and semiempirical formulas for Ne/sup 3 +/ to significant departures from any simple models for Xe/sup 3 +/. For Ar/sup 3 +/ some small departure from the models is apparent and the measurements agree with previous experimental results of Mueller et al. For Kr/sup 3 +/ and Xe/sup 3 +/ the measured cross sections in the energy range below four threshold units exhibit complex structure and exceed estimates of direct ionization by roughly factors of 2 and 3, respectively. These features are attributed to indirect ionization processes involving excitation of inner-shell electrons, and the observed cross-section shapes imply that the excitation-autoionization features cannot be simply attributed to dipole-allowed excitation transitions. Ionization rates for Maxwellian electron-temperature distributions are calculated from the data.

Authors:
; ;
Publication Date:
Research Org.:
Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
OSTI Identifier:
6266464
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Journal Article
Journal Name:
Phys. Rev. A; (United States)
Additional Journal Information:
Journal Volume: 27:2
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ARGON; ELECTRON-ION COLLISIONS; IONIZATION; KRYPTON; NEON; XENON; BOLTZMANN STATISTICS; CROSS SECTIONS; ELECTRON TEMPERATURE; EXCITATION; EXPERIMENTAL DATA; MULTICHARGED IONS; CHARGED PARTICLES; COLLISIONS; DATA; ELECTRON COLLISIONS; ELEMENTS; ENERGY-LEVEL TRANSITIONS; FLUIDS; GASES; INFORMATION; ION COLLISIONS; IONS; NONMETALS; NUMERICAL DATA; RARE GASES; 640304* - Atomic, Molecular & Chemical Physics- Collision Phenomena

Citation Formats

Gregory, D C, Dittner, P F, and Crandall, D H. Absolute-cross-section measurements for electron-impact ionization of triply charged inert-gas ions: Ne/sup 3 +/, Ar/sup 3 +/, Kr/sup 3 +/, and Xe/sup 3 +/. United States: N. p., 1983. Web. doi:10.1103/PhysRevA.27.724.
Gregory, D C, Dittner, P F, & Crandall, D H. Absolute-cross-section measurements for electron-impact ionization of triply charged inert-gas ions: Ne/sup 3 +/, Ar/sup 3 +/, Kr/sup 3 +/, and Xe/sup 3 +/. United States. doi:10.1103/PhysRevA.27.724.
Gregory, D C, Dittner, P F, and Crandall, D H. Tue . "Absolute-cross-section measurements for electron-impact ionization of triply charged inert-gas ions: Ne/sup 3 +/, Ar/sup 3 +/, Kr/sup 3 +/, and Xe/sup 3 +/". United States. doi:10.1103/PhysRevA.27.724.
@article{osti_6266464,
title = {Absolute-cross-section measurements for electron-impact ionization of triply charged inert-gas ions: Ne/sup 3 +/, Ar/sup 3 +/, Kr/sup 3 +/, and Xe/sup 3 +/},
author = {Gregory, D C and Dittner, P F and Crandall, D H},
abstractNote = {Electron-ion crossed beams have been employed to obtain absolute cross sections for single ionization of Ne/sup 3 +/, Ar/sup 3 +/, Kr/sup 3 +/, and Xe/sup 3 +/. These data reveal a steady progression from excellent agreement with theory and semiempirical formulas for Ne/sup 3 +/ to significant departures from any simple models for Xe/sup 3 +/. For Ar/sup 3 +/ some small departure from the models is apparent and the measurements agree with previous experimental results of Mueller et al. For Kr/sup 3 +/ and Xe/sup 3 +/ the measured cross sections in the energy range below four threshold units exhibit complex structure and exceed estimates of direct ionization by roughly factors of 2 and 3, respectively. These features are attributed to indirect ionization processes involving excitation of inner-shell electrons, and the observed cross-section shapes imply that the excitation-autoionization features cannot be simply attributed to dipole-allowed excitation transitions. Ionization rates for Maxwellian electron-temperature distributions are calculated from the data.},
doi = {10.1103/PhysRevA.27.724},
journal = {Phys. Rev. A; (United States)},
number = ,
volume = 27:2,
place = {United States},
year = {1983},
month = {2}
}