Potential-energy curves of core-excited NO molecules

Using an ab initio configuration interaction approach based on the Hartree- Fock method, the electronic energy levels of K-shell colt-vacant NO molecul es have been calculated as a function of the internuclear distance. The cal culation included many outer-shell excited states of the inner-shell vacant NO. The vacant states are either in the K-orbital of the N atom or the O a tom. The results of this calculation were compared with the spectroscopic d ata obtained using synchrotron radiation, and they were found to be in agre ement to within 1-2 eV. Using these present results, we look at the possibl e x-ray and W double-resonance absorption processes by NO molecules.