Correlation enhancement of the electron-impact ionization cross section for excited-state Ne-like ions
- Department of Physics, Auburn University, Auburn, Alabama 36849 (USA)
- Department of Physics, Rollins College, Winter Park, Florida 32789 (USA)
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (USA)
The electron-impact ionization cross section is calculated in the distorted-wave approximation for the Ne-like ions Ar{sup 8+}, Ti{sup 12+}, Fe{sup 16+}, Zn{sup 20+}, and Se{sup 24+}. For ionization from the 2{ital p}{sup 6} ground state, the contributions from inner-shell excitation followed by autoionization are negligible. However, when these ions are initially in the 2{ital p}{sup 5}3s excited configuration, contributions arising from the inner-shell excitations 2{ital p}{sup 5}3s{r arrow}2p{sup 4}3snl and 2{ital p}{sup 5}3s{r arrow}2s2p{sup 5}3snl are large. The overall branching ratio for autoionization of the 2{ital p}{sup 4}3snl and 2{ital s}2{ital p}{sup 5}3snl levels increases when the atomic-structure calculations are extended beyond the single-configuration approximation to include the configuration interaction. The resulting correlation enhancement of the excited-state ionization cross section is found to increase as a function of {ital Z}. For Se{sup 24+} the correlation enhancement of the total ionization cross section is found to be 42%.
- OSTI ID:
- 6851003
- Journal Information:
- Physical Review, A (General Physics); (USA), Vol. 41:3; ISSN 0556-2791
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ARGON IONS
ELECTRON-ION COLLISIONS
IRON IONS
SELENIUM IONS
TITANIUM IONS
ZINC IONS
AUTOIONIZATION
CROSS SECTIONS
DISTORTED WAVE THEORY
INNER-SHELL EXCITATION
IONIZATION
CHARGED PARTICLES
COLLISIONS
ELECTRON COLLISIONS
ENERGY-LEVEL TRANSITIONS
EXCITATION
ION COLLISIONS
IONS
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena