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

被引：5

作者：

Robert, Francois ^{[1
]}

Baraut-Guinet, Lambert ^{[1
,2
]}

Cartigny, Pierre ^{[2
]}

Reinhardt, Peter ^{[3
,4
]}

机构：

[1] Museum Natl Hist Nat, CNRS UMR 7590, Inst Mineral Phys Mat & Cosmochim, 61 Rue Buffon, F-75005 Paris, France

[2] Inst Phys Globe Paris, 1 Rue Jussieu, F-75005 Paris, France

[3] Sorbonne Univ, Lab Chim Theor, 4 Pl Jussieu, F-75252 Paris 05, France

[4] CNRS UMR 7616, 4 Pl Jussieu, F-75252 Paris 05, France

来源：

CHEMICAL PHYSICS | 2019年 / 523卷

关键词：

Ozone; Oxygen isotopes; Mass independent fractionation; Experimental observations; Theoretical predictions; HEAVY OZONE; OXYGEN; RECOMBINATION; DEPENDENCE; ENHANCEMENT; ISOTOPOMERS; CHEMISTRY; EXCHANGE; STRANGE; ORIGIN;

D O I：

10.1016/j.chemphys.2019.03.024

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Ozone exhibits large and mass independent isotopic fractionations (MIF) in oxygen isotope ratios relative to molecular di-oxygen (O-2) from which it is formed. An interpretation of this effect was proposed based on the behavior of the indistinguishable isotopes O-16 in scattering processes. We report here an experiment aimed at testing one of the predictions of this model. O-3 was formed by high frequency discharge in O-2 with pressures ranging between 1.6 and 38 Torr. The isotopic evolution of the closed O-2 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.

引用

页码：191 / 197

页数：7

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