Electron-impact excitation of the resonance transition in Be/sup +/

Journal Article · Sun May 15 04:00:00 EDT 1988 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.37.3755· OSTI ID:5264532

Mitroy, J; Norcross, D W

The cross section for electron-impact excitation of the resonance transition (2s-2p) of Be/sup +/ has been calculated in a variety of models at low incident-electron energies. Both five-state (2s,2p,3s,3p,3d) and nine-state (2s--3d,4s-bar,4p-bar,4d-bar,4f-bar) close-coupling (with and without polarization potentials) calculations have been completed. The results, while in good agreement with previous calculations, do not resolve all the long-standing discrepancies between theory and experiment. There are still significant discrepancies with the experimental cross section for the 2s-2p transition. However, previous calculations of the polarization of the resonance fluorescence used an expression for the scattering amplitude that was inappropriate for ions. The present results for the polarization use the correct expression, and are in good agreement with experiment. Calculations using the same approach for other quantities, specifically binding energies and resonance parameters, show small but significant improvements when compared with experiment.

• Research Organization: Joint Institute for Laboratory Astrophysics, University of Colorado National Bureau of Standards, P.O. Box 440, Boulder, Colorado 80309-0440
• OSTI ID: 5264532
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 37:10; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
BERYLLIUM IONS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELECTRON COLLISIONS
ELECTRON-ION COLLISIONS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
FLUORESCENCE
ION COLLISIONS
IONS
LUMINESCENCE
POLARIZATION
RESONANCE FLUORESCENCE
VIRTUAL STATES