Abstract
The chemielectron and mass-resolved ion spectra produced from the Ce + O{sub 2} reaction have been recorded. The mass spectrum together with approximate thermochemical and kinetic calculations have been used to show that the major chemiionization channel for this reaction under thermal conditions is the associative ionization process, Ce + O{sub 2} {yields} CeO{sub 2}{sup +} + e{sup {minus}}. The electron spectrum has been interpreted in terms of this process via a classical turning-point mechanism. CeO{sub 2}{sup +} and CeO{sup +} are observed as reaction products in the mass-resolved ion spectrum. CeO{sub 2}{sup +} arises almost completely from the above associative ionization reaction, whereas CeO{sup +} is shown to arise from more than one reaction in the Ce + O{sub 2} reaction scheme.
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