Abstract
In CO_{2}-rich atmospheres that are always exposed to ionizing radiation (e.g., Venus and Mars), every fragmentation process can significantly impact the inventory of moieties present in these environments. Nevertheless, the production of O_{2}^{+} ions as a direct result of CO_{2} fragmentation has never been quantified so far. Since molecular oxygen is considered as a potential trace of living organisms, nonbiotic pathways for its production must be known. In this work, O_{2}^{+} coming from CO_{2} fragmentation by electron impact is unambiguously identified and measured in absolute scale.
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