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Title: Distorted-wave calculations of the electron-impact excitation-autoionization processed from the ground state of highly ionized Ga I--like ions through. Delta. n =1 inner-shell excitations

Abstract

A systematic investigation of ionization enhancement due to collisional excitation followed by autoionization (EA) is presented for Ga I--like rare-earth elements. Both nuclear charge and temperature dependence are analyzed and compared with direct-impact ionization (DI) rates. Collisional excitation and autoionization rates were calculated in the distorted-wave factorization-interpolation method. DI rates were calculated by a modified plane-wave Born approximation method. The rates for the combined EA process for selected Ga I--like ions from Mo XII to Dy XXXVI are presented for the relevant temperature ranges. It is shown that indirect ionization is dominant for Mo through Pr but is reduced gradually with {ital Z} and approaches zero at Dy. A density diagnosis is provided by the opening of EA channels that are not active at low densities.

Authors:
;  [1]; ; ; ;  [2];  [3]
  1. Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA (USA)
  2. Racah Institute of Physics, The Hebrew University, 91904 Jerusalem, Israel (IL)
  3. Department of Physics and Space Science Laboratory, University of California, Berkeley, CA (USA)
Publication Date:
OSTI Identifier:
5267931
Resource Type:
Journal Article
Journal Name:
Physical Review A. General Physics; (United States)
Additional Journal Information:
Journal Volume: 44:3; Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ELECTRON-ION COLLISIONS; AUTOIONIZATION; EXCITATION; RARE EARTHS; DISTORTED WAVE THEORY; GALLIUM; ISOELECTRONIC ATOMS; REACTION KINETICS; ATOMS; COLLISIONS; ELECTRON COLLISIONS; ELEMENTS; ENERGY-LEVEL TRANSITIONS; ION COLLISIONS; IONIZATION; KINETICS; METALS; 640304* - Atomic, Molecular & Chemical Physics- Collision Phenomena

Citation Formats

Oreg, J, Goldstein, W, Mandelbaum, P, Mitnik, D, Meroz, E, Schwob, J L, and Bar Shalom, A. Distorted-wave calculations of the electron-impact excitation-autoionization processed from the ground state of highly ionized Ga I--like ions through. Delta. n =1 inner-shell excitations. United States: N. p., 1991. Web. doi:10.1103/PhysRevA.44.1741.
Oreg, J, Goldstein, W, Mandelbaum, P, Mitnik, D, Meroz, E, Schwob, J L, & Bar Shalom, A. Distorted-wave calculations of the electron-impact excitation-autoionization processed from the ground state of highly ionized Ga I--like ions through. Delta. n =1 inner-shell excitations. United States. https://doi.org/10.1103/PhysRevA.44.1741
Oreg, J, Goldstein, W, Mandelbaum, P, Mitnik, D, Meroz, E, Schwob, J L, and Bar Shalom, A. 1991. "Distorted-wave calculations of the electron-impact excitation-autoionization processed from the ground state of highly ionized Ga I--like ions through. Delta. n =1 inner-shell excitations". United States. https://doi.org/10.1103/PhysRevA.44.1741.
@article{osti_5267931,
title = {Distorted-wave calculations of the electron-impact excitation-autoionization processed from the ground state of highly ionized Ga I--like ions through. Delta. n =1 inner-shell excitations},
author = {Oreg, J and Goldstein, W and Mandelbaum, P and Mitnik, D and Meroz, E and Schwob, J L and Bar Shalom, A},
abstractNote = {A systematic investigation of ionization enhancement due to collisional excitation followed by autoionization (EA) is presented for Ga I--like rare-earth elements. Both nuclear charge and temperature dependence are analyzed and compared with direct-impact ionization (DI) rates. Collisional excitation and autoionization rates were calculated in the distorted-wave factorization-interpolation method. DI rates were calculated by a modified plane-wave Born approximation method. The rates for the combined EA process for selected Ga I--like ions from Mo XII to Dy XXXVI are presented for the relevant temperature ranges. It is shown that indirect ionization is dominant for Mo through Pr but is reduced gradually with {ital Z} and approaches zero at Dy. A density diagnosis is provided by the opening of EA channels that are not active at low densities.},
doi = {10.1103/PhysRevA.44.1741},
url = {https://www.osti.gov/biblio/5267931}, journal = {Physical Review A. General Physics; (United States)},
issn = {1050-2947},
number = ,
volume = 44:3,
place = {United States},
year = {Thu Aug 01 00:00:00 EDT 1991},
month = {Thu Aug 01 00:00:00 EDT 1991}
}