Effects of autoionizing resonances on electron-impact excitation rates for Be-like ions

Technical Report · Fri Apr 15 04:00:00 EDT 1988

OSTI ID:6861496

Chen, M H; Crasemann, B

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

Related Subjects

640304* -- Atomic
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