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O_{2}^{+} Production Coming from CO_{2} Single-Event Electron Impact.

Ana Beatriz Monteiro-Carvalho1, L Sigaud1, E C Montenegro2

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This summary is machine-generated.

Scientists quantified oxygen production from carbon dioxide fragmentation by electron impact. This research is crucial for understanding non-biological oxygen sources on planets like Venus and Mars.

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Area of Science:

  • Planetary Science
  • Astrochemistry
  • Atmospheric Chemistry

Background:

  • Carbon dioxide (CO2) rich atmospheres on planets like Venus and Mars are exposed to ionizing radiation.
  • Fragmentation of CO2 can significantly alter atmospheric composition.
  • Molecular oxygen (O2) is a potential biosignature, necessitating understanding of its non-biological production pathways.

Purpose of the Study:

  • To unambiguously identify and quantify O2+ ions produced from CO2 fragmentation by electron impact.
  • To establish a non-biological source for O2+ in CO2-rich planetary atmospheres.

Main Methods:

  • Electron impact fragmentation of carbon dioxide.
  • Mass spectrometry for unambiguous identification of O2+ ions.
  • Absolute scale measurements of O2+ production.

Main Results:

  • O2+ ions were unambiguously identified as a direct product of CO2 fragmentation by electron impact.
  • The production of O2+ was quantified on an absolute scale.

Conclusions:

  • This study provides the first quantification of O2+ production from CO2 fragmentation via electron impact.
  • Understanding this abiotic pathway is essential for interpreting the presence of oxygen in extraterrestrial environments and for the search for life.