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Formation of ozone by solid state reactions.

Lahouari Krim1, Mindaguas Jonusas, Jean Louis Lemaire

  • 1Sorbonne Université, CNRS, MONARIS, UMR 8233, 4 place Jussieu, Paris, F-75005, France. lahouari.krim@upmc.fr.

Physical Chemistry Chemical Physics : PCCP
|June 29, 2018
PubMed
Summary
This summary is machine-generated.

We investigated ozone formation from oxygen isotopes in solid-state reactions at low temperatures. The resulting ozone ice showed unique isotopic abundances, differing from statistical and gas-phase predictions.

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Area of Science:

  • Astrochemistry
  • Solid-state chemistry
  • Isotope effects

Background:

  • Ozone (O3) formation mechanisms are crucial for understanding planetary atmospheres.
  • Low-temperature solid-state reactions offer unique pathways for molecule synthesis.
  • Isotopic composition provides insights into reaction pathways and energy dynamics.

Purpose of the Study:

  • To investigate the isotopic composition of ozone formed via solid-state O + O2 reactions at low temperatures (3-10 K).
  • To explore the influence of reaction exothermicity and phase transitions on ozone formation.
  • To examine ozone formation on water ice and potential water dissociation mechanisms.

Main Methods:

  • Utilized a partially dissociated 16O/16O2 : 18O/18O2 = 1:1 mixture for solid-state reactions.
  • Analyzed isotopic abundances of ozone ice formed at 3-10 K.
  • Studied phase transitions of ozone ice upon heating past 50 K.
  • Investigated ozone formation on water ice using isotopic labeling (18O/18O2 on H216O ice).

Main Results:

  • Ozone ice exhibited isotopic abundances deviating from statistical distributions and gas-phase studies.
  • Ozone formation was influenced by competing reactions (O + O, O + O3, O + O2) and O + O reaction exothermicity.
  • Amorphous ozone ice transformed into crystalline ice above 50 K.
  • Ozone formation on water ice caused IR band blue shifts, with yields increasing up to 100 K.
  • Formation of 18O18O16O was detected when 18O/18O2 was deposited on H216O ice.

Conclusions:

  • The exothermicity of the O + O reaction plays a significant role in overcoming the O + O2 reaction barrier.
  • Proposed a mechanism where 18O + 18O reaction exothermicity drives water dissociation and subsequent ozone formation (16O + 18O2 → 16O18O18O) on water ice.