Resonance enhancement of electron-impact excitation rates for argonlike ions

Journal Article · Sat Jun 01 00:00:00 EDT 1991 · Physical Review, A; (USA)

DOI:https://doi.org/10.1103/PhysRevA.43.5886· OSTI ID:5594778

Chen, M H ^[1]; Crasemann, B ^[2]

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1. High Temperature Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94550 (USA)
2. Department of Physics and Chemical Physics Institute, University of Oregon, Eugene, Oregon 97403 (USA)

We have calculated the electron-impact excitation-rate coefficients for the 3{ital p}-3{ital d} transitions of Ar-like ions with {ital Z}=42, 54, and 63. The direct-excitation rates were evaluated with relativistic multiconfiguration target wave functions in a distorted-wave approximation. The contributions from the autoionizing resonances were calculated by the multiconfiguration Dirac-Fock method. For most transitions, autoionizing resonances are found to enhance the rate coefficients by factors of 2--3 for electron temperatures below the temperature at which peak excitation occurs. The enhancement is much less at higher temperatures.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5594778
• Journal Information: Physical Review, A; (USA), Vol. 43:11; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
EUROPIUM IONS
ELECTRON-ION COLLISIONS
MOLYBDENUM IONS
XENON IONS
AUGER EFFECT
CROSS SECTIONS
ELECTRON CAPTURE
EXCITATION
ISOELECTRONIC ATOMS
MULTICHARGED IONS
RELATIVISTIC RANGE
RESONANCE
ATOMS
CAPTURE
CHARGED PARTICLES
COLLISIONS
ELECTRON COLLISIONS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
ION COLLISIONS
IONS
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena