R-matrix calculation of the potential energy curves for Rydberg states of carbon monoxide

An electron collision formalism is used to consider Rydberg states of the CO molecule as a function of internuclear separation. Up to 14 target states of CO+ are used in close-coupled expansion and bound states are characterized by searching for negative energy solutions of the scattering calculations. These calculations give potential energy curves for excited states of CO as well as quantum defects as a function of internuclear separation, R. The quantum defects are found to depend only weakly on R except in the region of perturbations caused by intruder states.

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