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Calculations of the photodissociation cross sections of CO from the ground X$^1\Sigma^+$ state into the coupled Rydberg B$^1\Sigma^+$ state and the valence dissociative D$^{'1}\Sigma^+$ state have been carried out using the smooth exterior complex scaling (SECS) method. Results are presented for all of the 6 isotopomers involving the  12 C, 13 C, 16 O, 17 O and 18 O isotopes. The absorption profiles of the predissociating resonances induced by non-adiabatic coupling vary considerably from one isotopomer to another. It is confirmed that resonance widths obtained simply from a diagonalization of the complex Hamiltonian do not give a true indication of the absorption profile. A correct profile is only obtained when the sum over all resonant and non-resonant continuum states is performed. A brief discussion is given of the implications for isotopic fractionation in interstellar CO.

Effect of non-adiabatic coupling on the isotopic dependence of the photodissociation cross section of CO