Electron collisions with CO molecule: potential energy curves of higher lying CO-resonant states

Resonance energies and widths of eight long-lived metastable electronic states of the CO(-)anion are obtained using theR-matrix method as a function of bond distance. High-levelab initioscattering calculations are performed for a large number (above 150) of fixed-nuclear geometries using the large cc-pV6Z Gaussian basis set and a close-coupling model involving 27 low-lying target states. Potential curves for narrow resonances, three(2)sigma(+), four(2)pi and one(2)Delta, in the 10-14 eV region are reported, along with the data on the low-lying(2)pi shape resonance. These curves provide a starting point for performing nuclear dynamics and hence studies of dissociative attachment via these states.