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 beryllium-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:
- Oregon Univ., Eugene (USA)
- OSTI ID:
- 6861496
- Report Number(s):
- AD-A-199407/8/XAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ALKALINE EARTH METALS
ATOMS
BERYLLIUM
CHARGED PARTICLES
COLLISIONS
DIPOLES
ELECTRON COLLISIONS
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EXCITATION
IONIZATION
IONS
ISOELECTRONIC ATOMS
MASS NUMBER
METALS
MULTIPOLES
RESONANCE