International audienceThe ratio of the differential scattering cross sections involving distinguishable and indistinguishable isotopes may exhibit non-mass dependent angular variations. A numerical application of this hypotheses to the ozone reaction rates reproduces some of the results observed in laboratory experiments. This theory could be tested through a cross beam experiment where the isotopic composition of the scattered products is recorded as a function of their scattering angles

Camy-Peyret, C.

Robert, F.

Abstract. The ratio of the differential scattering cross sec-tions involving distinguishable and indistinguishable isotopes may exhibit non-mass dependent angular variations. A nu-merical application of this hypotheses to the ozone reaction rates reproduces some of the results observed in laboratory experiments. This theory could be tested through a cross beam experiment where the isotopic composition of the scat-tered products is recorded as a function of their scattering angles. Key words. Atmospheric composition and structure (middle atmosphere – composition and chemistry) Glossary General formalism – A and B: two isotopes of the same chemical element – XA and XB: two isotopically substituted molecules – [A] and [XA]: the number densities of A and XA, respec-tively – R as subscript: stands for reactive. Used for reactions yielding an exchange of isotopes such as A+ XB → XA+ B – NR as subscript: stands for non-reactive. Used for reac-tions which do not yield an isotope exchange such as A+ XB → A+ XB – T as subscript: stands for total – kA−XB,R: isotopic exchange rate constant – α: isotopic fractionation factor – θ and pi − θ: the scattering angle expressed in coordinates of the center of mass frame (see Figs. 1 and 3) – θXA: the scattering angle of XA – F(θ): the differential cross section describing the particle scattering at a collisional angle θ and at relative velocity v. Usually reported in the literature as F(θ)  = |f (θ)|2 – 8i: in the cross beam experiments, the flux of species i Correspondence to: F. Rober

Ozone isotopic composition: an angular effect in scattering processes?

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