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Using state of the art methods of quantum chemistry, potential energy surfaces for the formation of CO2(1Σg+) and CO 2 ( 3 B 2 ) from CO+O ( 1 D) and CO+O ( 3 P), respectively, have been studied. At the MRSDCI level, we show that the formation of CO2(1Σg+) from O ( 3 P) is strongly connected with the height of the barrier localized on the CO+O ( ...