Electron-impact excitation of the resonance transition in Be/sup +/: An ab initio treatment of core-correlation and -polarization effects
We present theoretical electron-impact-excitation cross sections for several transitions in Be/sup +/, and fluorescence radiation polarizations for the Be/sup +/ resonance doublet. The projectile-electron energy varies from 0.3--2.0 Ry. A five-state close-coupling approximation is used. The target model is the most sophisticated employed in any scattering calculation to date, and yields oscillator strengths for several transitions in Be/sup +/ that are the most accurate available. Our results do not, however, improve upon previous work as regards the notable discrepancies between calculations and experimental measurements for excitation of the resonance transition. This indicates that high rigor in the treatment of short-range core-correlation effects is not required for an accurate description of these processes, and therefore either that other, heretofore ignored, effects must be taken into account in the theory or that other measurements are necessary. An accurate measurement of the hyperfine structure of the j = (3/2) fine-structure level of the doublet would be of particular and decisive importance.
- Research Organization:
- Joint Institute for Laboratory Astrophysics, National Bureau of Standards and University of Colorado, Boulder, Colorado 80309-0440
- OSTI ID:
- 7167367
- Journal Information:
- Phys. Rev. A; (United States), Vol. 34:6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BERYLLIUM IONS
ELECTRON-ION COLLISIONS
EXCITATION
CROSS SECTIONS
ELECTRONIC STRUCTURE
ENERGY-LEVEL TRANSITIONS
EXPERIMENT PLANNING
OSCILLATOR STRENGTHS
RESONANCE
CHARGED PARTICLES
COLLISIONS
ELECTRON COLLISIONS
ION COLLISIONS
IONS
PLANNING
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena