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Title: Absolute cross sections for the electron-impact single ionization of Mo{sup 4+} and Mo{sup 5+} ions

Abstract

Absolute total cross sections for the electron-impact single ionization of Mo{sup 4+} and Mo{sup 5+} ions have been measured using a crossed-beams technique from below the ground-state ionization threshold to 500 eV with typical total uncertainties of 9% near the peak of the cross sections. Molybdenum ion production in the source was facilitated by a mini-oven sublimating MoO{sub 3}. The measured cross sections are in good agreement with distorted-wave calculations and are dominated by contributions from excitation autoionization. Nonzero cross sections below the threshold for ionization of Mo{sup 5+}(4{ital p}{sup 6}4{ital d}) ground-state ions indicate that metastable ions were present in the beam extracted from an electron-cyclotron-resonance ion source. No evidence of metastable ions was found in the case of the Mo{sup 4+} measurements. Ionization rate coefficients and fitting parameters are presented for the experimental data.

Authors:
;  [1]; ; ;  [2];  [3];  [4]
  1. Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 38731-6372 (United States)
  2. Joint Institute for Laboratory Astrophysics of the University of Colorado and the National Institute of Standards and Technology, Boulder, Colorado 80309-0440 (United States)
  3. Department of Physics, Auburn University, Auburn, Alabama 36849 (United States)
  4. Department of Physics, Rollins College, Winter Park, Florida 32789 (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory
OSTI Identifier:
82265
DOE Contract Number:  
AC05-84OR21400; AI05-86ER53237
Resource Type:
Journal Article
Journal Name:
Physical Review A
Additional Journal Information:
Journal Volume: 52; Journal Issue: 1; Other Information: PBD: Jul 1995
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; MOLYBDENUM IONS; ELECTRON-ION COLLISIONS; IONIZATION; MULTICHARGED IONS; TOTAL CROSS SECTIONS; ABSOLUTE COUNTING; GROUND STATES; METASTABLE STATES

Citation Formats

Bannister, M E, Meyer, F W, Chung, Y S, Djuric, N, Dunn, G H, Pindzola, M S, and Griffin, D C. Absolute cross sections for the electron-impact single ionization of Mo{sup 4+} and Mo{sup 5+} ions. United States: N. p., 1995. Web. doi:10.1103/PhysRevA.52.413.
Bannister, M E, Meyer, F W, Chung, Y S, Djuric, N, Dunn, G H, Pindzola, M S, & Griffin, D C. Absolute cross sections for the electron-impact single ionization of Mo{sup 4+} and Mo{sup 5+} ions. United States. doi:10.1103/PhysRevA.52.413.
Bannister, M E, Meyer, F W, Chung, Y S, Djuric, N, Dunn, G H, Pindzola, M S, and Griffin, D C. Sat . "Absolute cross sections for the electron-impact single ionization of Mo{sup 4+} and Mo{sup 5+} ions". United States. doi:10.1103/PhysRevA.52.413.
@article{osti_82265,
title = {Absolute cross sections for the electron-impact single ionization of Mo{sup 4+} and Mo{sup 5+} ions},
author = {Bannister, M E and Meyer, F W and Chung, Y S and Djuric, N and Dunn, G H and Pindzola, M S and Griffin, D C},
abstractNote = {Absolute total cross sections for the electron-impact single ionization of Mo{sup 4+} and Mo{sup 5+} ions have been measured using a crossed-beams technique from below the ground-state ionization threshold to 500 eV with typical total uncertainties of 9% near the peak of the cross sections. Molybdenum ion production in the source was facilitated by a mini-oven sublimating MoO{sub 3}. The measured cross sections are in good agreement with distorted-wave calculations and are dominated by contributions from excitation autoionization. Nonzero cross sections below the threshold for ionization of Mo{sup 5+}(4{ital p}{sup 6}4{ital d}) ground-state ions indicate that metastable ions were present in the beam extracted from an electron-cyclotron-resonance ion source. No evidence of metastable ions was found in the case of the Mo{sup 4+} measurements. Ionization rate coefficients and fitting parameters are presented for the experimental data.},
doi = {10.1103/PhysRevA.52.413},
journal = {Physical Review A},
number = 1,
volume = 52,
place = {United States},
year = {1995},
month = {7}
}