Inner-shell excitation and ionization in carbon monoxide, near threshold, using a high-resolution electron spectrometer

Abstract

The inner-shell excited states, (1s)-1(2pu)1,3u of carbon monoxide have been observed in electron impact excitation, as a function of incident energy via their decay, by electronic ejection, to an ionic state of the molecule. A shift in the energies of these ejected electrons has been observed and is explained in terms of a post-collision interaction effect. A detailed description of the apparatus is presented. The relative cross section for the formation of the CO+(B 2u) final ionic state, via the decay of these inner-shell excited states, is compared with predictions of a theoretical model.