In this paper we report our calculations on several important total cross-sections (TCSe?‘?) of positron impact on isoelectronic N2 and CO molecules, treated in the complex spherical potential formalism. Basically the total (complete) cross-section e?‘?T consists of elastic and inelastic contributions. Our total inelastic cross-section (e?‘?inel) contains ionization and electronic excitations together with positronium formation. Our goal here is to bifurcate e?‘?inel further to deduce total ionization cross-section, using the `complex scattering potentiala€“ionization contributiona€? (CSP-ic) method of electrona€“atom/molecule scattering. The present range of positron energy is 15a€“2000 eV. All the resulting cross-sections are in a good general accord with the existing data. This work highlights the importance of various scattering channels in e?‘’+ - e?‘?2 and e?‘’+ - CO interactions at intermediate and high energies.
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