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O(-) from amorphous and crystalline CO2 ices.

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This summary is machine-generated.

This study investigated O(-) desorption from CO2 films using electron impact. Amorphous CO2 films showed significantly higher desorption rates than crystalline films, with a dominant 4 eV resonance observed.

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Area of Science:

  • Surface science
  • Physical chemistry
  • Astrochemistry

Background:

  • Electron-induced desorption is crucial for understanding surface chemistry.
  • Carbon dioxide (CO2) films are relevant in planetary atmospheres and interstellar ice.

Purpose of the Study:

  • To investigate the desorption of O(-) ions from amorphous and crystalline CO2 films.
  • To characterize the influence of film morphology on desorption dynamics.

Main Methods:

  • Time-of-flight mass spectrometry for O(-) detection.
  • Fourier transform infrared spectrometry for film characterization.
  • Low-energy electron impact.

Main Results:

  • Desorption rates were significantly higher from amorphous CO2 films compared to crystalline films.
  • A 4 eV electron resonance dominated O(-) desorption, unlike the 8 eV resonance in gas-phase CO2.
  • Enhanced dissociative electron attachment cross-section in condensed phase explains the 4 eV resonance dominance.

Conclusions:

  • Film morphology strongly influences electron-induced O(-) desorption from CO2.
  • Condensed phase effects significantly alter electron-molecule interactions compared to the gas phase.