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Abstract
Electron impact excitation of Ca II is investigated in six-state and three-state close-coupling (CC) approximations using accurate target wavefunctions for the ground state and the five lowest excited states. The results demonstrate the unanticipated enhancement of the cross section sigma (4s to 4d) over sigma (4s to 3d) in the energy range 3.3<or=E<or=100 eV, which is attributed to the virtual 'double-dipole' transition through the 4p 2Po state. Cascade contribution to the resonance cross section is found to be almost consistent with experimental estimates (about 18% at 10 eV, which decreases to roughly 7% at 100 eV). Comparison of the authors' six-state and three-state CC cross sections with some existing theoretical and experimental data is effected.
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Schedule a callMore From: Journal of Physics B: Atomic, Molecular and Optical Physics
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