1. An experimental test for the mass independent isotopic fractionation mechanism proposed for ozone
- Author
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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), and Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Ozone ,Analytical chemistry ,General Physics and Astronomy ,Fractionation ,010402 general chemistry ,01 natural sciences ,Isotopes of oxygen ,law.invention ,chemistry.chemical_compound ,law ,0103 physical sciences ,Mass independent fractionation ,Physical and Theoretical Chemistry ,Distillation ,010304 chemical physics ,Isotope ,Theoretical predictions ,Scattering ,Condensation ,Mass-independent fractionation ,0104 chemical sciences ,chemistry ,13. Climate action ,Oxygen isotopes ,[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] ,Experimental observations - 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.
- Published
- 2019
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