Effects of autoionizing resonances on electron-impact excitation rates for Be-like ions
The effects of autoionizing resonances on the electron-impact excitation rates for n = 2 to n = 2 intrashell transitions in Be-like ions have been studied for six ions with atomic numbers Z = 30, 34, 36, 42, 47, and 54. The resonance contributions to the excitation rates were calculated in the isolated-resonance approximation. Detailed Auger and radiative rates were evaluated in the multiconfiguration Dirac-Fock model. Results are compared with background rates from the Coulomb-Born-exchange approximation. Autoionizing resonance have been found to enhance the electron-impact excitation rates by a factor of 2--4 for the electric-dipole-forbidden transitions, while for dipole-allowed transitions, the resonance effects amount to only a few percent of these rates.
- 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:
- 5338421
- Journal Information:
- Phys. Rev. A; (United States), Vol. 37:8
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
KRYPTON IONS
AUTOIONIZATION
ELECTRON-ION COLLISIONS
MOLYBDENUM IONS
SELENIUM IONS
SILVER IONS
XENON IONS
ZINC IONS
AUGER EFFECT
AUGMENTATION
CROSS SECTIONS
E1-TRANSITIONS
EXCITATION
ISOELECTRONIC ATOMS
RESONANCE
ATOMS
CHARGED PARTICLES
COLLISIONS
ELECTRON COLLISIONS
ENERGY-LEVEL TRANSITIONS
ION COLLISIONS
IONIZATION
IONS
MULTIPOLE TRANSITIONS
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena