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Title: Absolute cross sections for electron-impact single ionization of Kr[sup 4+], Kr[sup 5+], and Kr[sup 7+] ions

Abstract

Absolute total cross sections for electron-impact single ionization of Kr[sup 4+], Kr[sup 5+], and Kr[sup 7+] ions have been measured using a crossed-beams technique from below threshold to 500, 400, and 500 eV, respectively, with absolute uncertainties of 12% or less. The measured cross sections are in good agreement with distorted-wave calculations and show significant contributions from excitation autoionization. Nonzero cross sections below threshold for the Kr[sup 4+] and Kr[sup 5+] ions suggest the presence of metastable ions in those two species that were extracted from an electron-cyclotron-resonance ion source. Such evidence of metastable ions was not found in the case of the Kr[sup 7+] ion measurment.

Authors:
 [1]; ;  [2]
  1. Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6372 (United States)
  2. Joint Institute for Laboratory Astrophysics of the University of Colorado, the National Institute of Standards and Technology, Boulder, Colorado 80309-0440 (United States)
Publication Date:
OSTI Identifier:
7307484
Resource Type:
Journal Article
Journal Name:
Physical Review A; (United States)
Additional Journal Information:
Journal Volume: 49:6; Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; KRYPTON IONS; ELECTRON-ION COLLISIONS; COLLIDING BEAMS; IONIZATION; METASTABLE STATES; MULTICHARGED IONS; TOTAL CROSS SECTIONS; BEAMS; CHARGED PARTICLES; COLLISIONS; CROSS SECTIONS; ELECTRON COLLISIONS; ENERGY LEVELS; EXCITED STATES; ION COLLISIONS; IONS; 664300* - Atomic & Molecular Physics- Collision Phenomena- (1992-)

Citation Formats

Bannister, M E, Guo, X Q, and Kojima, T M. Absolute cross sections for electron-impact single ionization of Kr[sup 4+], Kr[sup 5+], and Kr[sup 7+] ions. United States: N. p., 1994. Web. doi:10.1103/PhysRevA.49.4676.
Bannister, M E, Guo, X Q, & Kojima, T M. Absolute cross sections for electron-impact single ionization of Kr[sup 4+], Kr[sup 5+], and Kr[sup 7+] ions. United States. doi:10.1103/PhysRevA.49.4676.
Bannister, M E, Guo, X Q, and Kojima, T M. Wed . "Absolute cross sections for electron-impact single ionization of Kr[sup 4+], Kr[sup 5+], and Kr[sup 7+] ions". United States. doi:10.1103/PhysRevA.49.4676.
@article{osti_7307484,
title = {Absolute cross sections for electron-impact single ionization of Kr[sup 4+], Kr[sup 5+], and Kr[sup 7+] ions},
author = {Bannister, M E and Guo, X Q and Kojima, T M},
abstractNote = {Absolute total cross sections for electron-impact single ionization of Kr[sup 4+], Kr[sup 5+], and Kr[sup 7+] ions have been measured using a crossed-beams technique from below threshold to 500, 400, and 500 eV, respectively, with absolute uncertainties of 12% or less. The measured cross sections are in good agreement with distorted-wave calculations and show significant contributions from excitation autoionization. Nonzero cross sections below threshold for the Kr[sup 4+] and Kr[sup 5+] ions suggest the presence of metastable ions in those two species that were extracted from an electron-cyclotron-resonance ion source. Such evidence of metastable ions was not found in the case of the Kr[sup 7+] ion measurment.},
doi = {10.1103/PhysRevA.49.4676},
journal = {Physical Review A; (United States)},
issn = {1050-2947},
number = ,
volume = 49:6,
place = {United States},
year = {1994},
month = {6}
}