Scattering and spectroscopy: Relativistic multichannel quantum-defect theory

Abstract
A formulation of relativistic multichannel quantum-defect theory is presented. The relativistic random-phase approximation is applied to calculate the eigenchannel parameters in the relativistic multichannel quantum-defect theory. The resonances due to inner-shell (1s) excitations below the K threshold for ions of the Be isoelectronic sequence are studied as illustrative examples.

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