The photolysis of carbon dioxide with xenon resonance radiation (1470 Å) has been used as a source of excited atomic oxygen O(1D). The exchange and quenching reactions of O(1D) with carbon dioxide have been investigated by measuring the rate of growth of CO16O18 in a photolyzed mixture of CO16O16 and CO18O18. The probability αN of incorporation of each O(1D) into a CO2 molecule before quenching can occur is 0.69. Possible interpretations of this result are discussed. The simplest explanation of the exchange kinetics is provided by the intermediate formation of CO3. This species must be sufficiently long lived for internal energy equilibration to take place.