Resonance enhancement of electron collision rates for fluorinelike ions
The distorted-wave approximation and similar weak-coupling methods are frequently used to calculate electron collision cross sections for studies of astrophysical and laboratory plasmas. Autoionizing resonances neglected in these approximations can significantly enhance the calculated rates for collisional excitation of some transitions in highly charged ions. We investigated the effects of such resonances on the excitation rates for n = 2 to n = 2 transitions in fluorinelike Fe, Se, Mo, Ag, Xe, and Eu. The background excitation rates were calculated using a relativistic distorted-wave approximation, and the detailed Auger and radiative rates were calculated using a multiconfiguration Dirac-Fock model. The largest effect is on the electric-dipole-forbidden transitions. The enhancement diminishes with increasing atomic number for all transitions.
- Research Organization:
- High Temperature Physics Division, University of California, Lawrence Livermore National Laboratory, Livermore, California 94550
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6015824
- Journal Information:
- Phys. Rev. A; (United States), Vol. 36:7
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
EUROPIUM IONS
ELECTRON-ION COLLISIONS
IRON IONS
MOLYBDENUM IONS
SELENIUM IONS
SILVER
XENON IONS
AUGER EFFECT
AUTOIONIZATION
CROSS SECTIONS
DISTORTED WAVE THEORY
E1-TRANSITIONS
EXCITATION
MULTICHARGED IONS
RADIATIVE DECAY
RESONANCE
CHARGED PARTICLES
COLLISIONS
ELECTRON COLLISIONS
ELEMENTS
ENERGY-LEVEL TRANSITIONS
ION COLLISIONS
IONIZATION
IONS
METALS
MULTIPOLE TRANSITIONS
TRANSITION ELEMENTS
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena