Abstract

The species produced by ionizing radiation in supercritical CO 2 have been measured at a reduced temperature of 1.03 from 78 to 117 bar. It has been shown that C 2O 4 + is formed. This then reacts with positive ion scavengers. Its rate constant with dimethylaniline is 1.2×10 11 l mol −1 s −1 at 104 bar. The amount of C 2O 4 + formed is not proportional to the CO 2 density. This is attributed to an increased escape of the geminate ions at lower densities. We have also measured the production of ozone, which implies the production of O atoms and a production of oxygen molecules.

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