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An experimental test for the mass independent isotopic fractionation mechanism proposed for ozone

An experimental test for the mass independent isotopic fractionation mechanism proposed for ozone

Authors :
Peter Reinhardt
François Robert
Pierre Cartigny
Lambert Baraut-Guinet
Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC)
Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Institut de Physique du Globe de Paris (IPGP)
Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)
Laboratoire de chimie théorique (LCT)
Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Centre National de la Recherche Scientifique (CNRS)-Université de La Réunion (UR)-Université Paris Diderot - Paris 7 (UPD7)-IPG PARIS-Institut national des sciences de l'Univers (INSU - CNRS)
Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Source :
Chemical Physics, Chemical Physics, 2019, 523, pp.191-197. ⟨10.1016/j.chemphys.2019.03.024⟩, Chemical Physics, Elsevier, 2019, 523, pp.191-197. ⟨10.1016/j.chemphys.2019.03.024⟩
Publication Year :
2019
Publisher :
Elsevier BV, 2019.

Abstract

International audience; Ozone exhibits large and mass independent isotopic fractionations (MIF) in oxygen isotope ratios relative to molecular di-oxygen (O2) from which it is formed. An interpretation of this effect was proposed based on the behavior of the indistinguishable isotopes 16O in scattering processes. We report here an experiment aimed at testing one of the predictions of this model.O3 was formed by high frequency discharge in O2 with pressures ranging between 1.6 and 38 Torr. The isotopic evolution of the closed O2 reservoir was monitored during its distillation taking place during the continuous removal of ozone by condensation. Its composition evolves from a mass independent to a mass dependent fractionation along with the decrease in pressure. The isotopic pathways defined by this evolution in the 3 isotopes diagram are in quantitative agreement with the theoretical prediction of the disappearance of MIF with the increase of the complex lifetime stabilized as ozone.

Details

ISSN :
03010104
Volume :
523
Database :
OpenAIRE
Journal :
Chemical Physics
Accession number :
edsair.doi.dedup.....1a52612dbdea2db22d5278e608aa9346
Full Text :
https://doi.org/10.1016/j.chemphys.2019.03.024