Formation of ozone by solid state reactions

Lahouari Krim; Mindaguas Jonusas; Jean Louis Lemaire; Gianfranco Vidali

doi:10.1039/c8cp03020k

Formation of ozone by solid state reactions

Lahouari Krim, Mindaguas Jonusas, Jean Louis Lemaire, Gianfranco Vidali

Department of Physics

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6 Scopus citations

Abstract

We studied the isotopic composition of ozone formed at low (3-10 K) temperature via O + O₂ solid state reactions using a partially dissociated ¹⁶O/¹⁶O₂:¹⁸O/¹⁸O₂ = 1:1 mixture. The ozone ice has an isotopic abundance that differs from the statistical one and from gas phase studies. Ozone formation is influenced by the competition of the production of O₂ (O + O or O + O₃) vs. O₃ (O + O₂) and by the energy released in the O + O reaction. The exothermicity of the O + O reaction helps to overcome the barrier of the O + O₂ reaction. Heating the ozone ice past 50 K brings about a transformation from amorphous to crystalline ice. The formation of ozone on water ice yields a blue shift of IR bands, and the yield of formed O₃ increases up to the sample temperature of 100 K. When ¹⁸O/¹⁸O₂ is deposited on H₂ ¹⁶O ice, formation of ¹⁸O¹⁸O¹⁶O is detected. We propose that the exothermicity of the reaction ¹⁸O + ¹⁸O drives water dissociation (¹⁶O + H₂) followed by ozone formation (¹⁶O + ¹⁸O₂ → ¹⁶O¹⁸O¹⁸O).

Original language	English (US)
Pages (from-to)	19750-19758
Number of pages	9
Journal	Physical Chemistry Chemical Physics
Volume	20
Issue number	30
DOIs	https://doi.org/10.1039/c8cp03020k
State	Published - 2018

ASJC Scopus subject areas

General Physics and Astronomy
Physical and Theoretical Chemistry

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title = "Formation of ozone by solid state reactions",

abstract = "We studied the isotopic composition of ozone formed at low (3-10 K) temperature via O + O2 solid state reactions using a partially dissociated 16O/16O2:18O/18O2 = 1:1 mixture. The ozone ice has an isotopic abundance that differs from the statistical one and from gas phase studies. Ozone formation is influenced by the competition of the production of O2 (O + O or O + O3) vs. O3 (O + O2) and by the energy released in the O + O reaction. The exothermicity of the O + O reaction helps to overcome the barrier of the O + O2 reaction. Heating the ozone ice past 50 K brings about a transformation from amorphous to crystalline ice. The formation of ozone on water ice yields a blue shift of IR bands, and the yield of formed O3 increases up to the sample temperature of 100 K. When 18O/18O2 is deposited on H2 16O ice, formation of 18O18O16O is detected. We propose that the exothermicity of the reaction 18O + 18O drives water dissociation (16O + H2) followed by ozone formation (16O + 18O2 → 16O18O18O).",

author = "Lahouari Krim and Mindaguas Jonusas and Lemaire, {Jean Louis} and Gianfranco Vidali",

note = "Publisher Copyright: {\textcopyright} 2018 the Owner Societies.",

year = "2018",

doi = "10.1039/c8cp03020k",

language = "English (US)",

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journal = "Physical Chemistry Chemical Physics",

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T1 - Formation of ozone by solid state reactions

AU - Krim, Lahouari

AU - Jonusas, Mindaguas

AU - Lemaire, Jean Louis

AU - Vidali, Gianfranco

PY - 2018

Y1 - 2018

N2 - We studied the isotopic composition of ozone formed at low (3-10 K) temperature via O + O2 solid state reactions using a partially dissociated 16O/16O2:18O/18O2 = 1:1 mixture. The ozone ice has an isotopic abundance that differs from the statistical one and from gas phase studies. Ozone formation is influenced by the competition of the production of O2 (O + O or O + O3) vs. O3 (O + O2) and by the energy released in the O + O reaction. The exothermicity of the O + O reaction helps to overcome the barrier of the O + O2 reaction. Heating the ozone ice past 50 K brings about a transformation from amorphous to crystalline ice. The formation of ozone on water ice yields a blue shift of IR bands, and the yield of formed O3 increases up to the sample temperature of 100 K. When 18O/18O2 is deposited on H2 16O ice, formation of 18O18O16O is detected. We propose that the exothermicity of the reaction 18O + 18O drives water dissociation (16O + H2) followed by ozone formation (16O + 18O2 → 16O18O18O).

AB - We studied the isotopic composition of ozone formed at low (3-10 K) temperature via O + O2 solid state reactions using a partially dissociated 16O/16O2:18O/18O2 = 1:1 mixture. The ozone ice has an isotopic abundance that differs from the statistical one and from gas phase studies. Ozone formation is influenced by the competition of the production of O2 (O + O or O + O3) vs. O3 (O + O2) and by the energy released in the O + O reaction. The exothermicity of the O + O reaction helps to overcome the barrier of the O + O2 reaction. Heating the ozone ice past 50 K brings about a transformation from amorphous to crystalline ice. The formation of ozone on water ice yields a blue shift of IR bands, and the yield of formed O3 increases up to the sample temperature of 100 K. When 18O/18O2 is deposited on H2 16O ice, formation of 18O18O16O is detected. We propose that the exothermicity of the reaction 18O + 18O drives water dissociation (16O + H2) followed by ozone formation (16O + 18O2 → 16O18O18O).

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JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

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Formation of ozone by solid state reactions

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