The formation and the subsequent reactions of positive and negative ions were observed by a TRAPI in an atmospheric pressure carbon dioxide added with small amounts of carbon monoxide and oxygen. A relatively stable ion of (44 × n) + ( n ≥ 2) having a different reactivity from that of (CO 2) + n was found to be one of major ionic species in this gas system. This species was tentatively assigned as [O 2(CO) 2] + (CO 2) n-2 . A new reaction sequence of positive ions is proposed which can be operative in the radiolysis of carbon dioxide at 1 atm.

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