A non-adiabatic calculation of NO Rydberg states above several ionisation thresholds

An ab initio study of the ns, np, nd, nf and ng Rydberg series of NO above a number of ionisation thresholds is presented. Calculations of the eigenphase sum of electron scattering by NO+, using a non-adiabatic R-matrix method, are used to obtain vibrationally resolved positions and widths of NO autoionizing states. The complex quantum defects of the resonances are used to identify the Rydberg series, and these are separated according to the vibrational state of the target. Comparisons are made with experimental studies of this system. (C) 1998 Elsevier Science B.V.