Relative formation rates of O350 and O352 in O16–18O mixtures

Janssen, Christof; Guenther, Juergen; Krankowsky, D.; Mauersberger, K.

doi:10.1063/1.480045

Cited by 102 publications

(83 citation statements)

References 19 publications

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“…(iii) O 3 was set to be solely dependent on temperature, because all laboratory data indicate negligible pressure dependence below 100 hPa and because it appears that all reliable atmospheric data agree with the enrichments determined in laboratory studies (Johnson et al, 2000;Mauersberger et al, 2001). The (consistent) laboratory data by Jackson (1988, 1990), Morton et al (1990), and are implemented under the assumption that 80% of the isotope enrichment of O 3 is carried by the asymmetric QOO (Anderson et al, 1989;Janssen et al, 1999;Mauersberger et al, 1999 …”

Section: Trace Gas Parameter Profilesmentioning

confidence: 99%

“…This discrepancy arises from the different 17 O signatures assumed for the asymmetric O 3 molecule and O( 1 D). Lyons (2001) used (i) the branching ratios of 0.43 and 0.57 for δ 18 O in the reaction of O+QO−→OQO and QOO as measured by Janssen et al (1999) for δ 17 O, too, and (ii) the isotope fractionation factors for this reaction measured by . This assumption led to 17 …”

Section: The Formation Of New Oh Bondsmentioning

confidence: 99%

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Modelling the budget of middle atmospheric water vapour isotopes

Zahn¹,

Franz

Bechtel

et al. 2006

Atmos. Chem. Phys.

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Abstract.A one-dimensional chemistry model is applied to study the stable hydrogen (D) and stable oxygen isotope ( 17 O, 18 O) composition of water vapour in stratosphere and mesosphere. In the troposphere, this isotope composition is determined by "physical" fractionation effects, that are phase changes (e.g. during cloud formation), diffusion processes (e.g. during evaporation from the ocean), and mixing of air masses. Due to these processes water vapour entering the stratosphere first shows isotope depletions in D/H relative to ocean water, which are ∼5 times of those in 18 In the stratosphere the known mass-independent fractionation (MIF) signal in O 3 is in a first step transferred to the NO x family and only in a second step to HO x and H 2 O. In contrast to CO 2 , O( 1 D) only plays a minor role in this MIF transfer. The major uncertainty in our calculation arises from poorly quantified isotope exchange reaction rate coefficients and kinetic isotope fractionation factors.

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Section: Trace Gas Parameter Profilesmentioning

confidence: 99%

Section: The Formation Of New Oh Bondsmentioning

confidence: 99%

Modelling the budget of middle atmospheric water vapour isotopes

Zahn¹,

Franz

Bechtel

et al. 2006

Atmos. Chem. Phys.

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“…Experimental studies of various isotopic substitutions in this reaction indicate that asymmetric ozone molecules are formed at higher rates, compared to their symmetric isotopomers. [9][10][11][12][13][14] For example, consider ozone molecule substituted with one 18 O atom, a singly substituted a) Author to whom correspondence should be addressed. O 16 O.…”

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confidence: 99%

On stabilization of scattering resonances in recombination reaction that forms ozone

Ivanov

Babikov

2016

The Journal of Chemical Physics

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Calculations of energy transfer in the recombination reaction that forms ozone are carried out within the framework of the mixed quantum/classical theory and using the dimensionally reduced 2D-model of ozone molecule, with bending motion neglected. Recombination rate coefficients are obtained at room temperature for symmetric and asymmetric isotopomers of singly and doubly substituted isotopologues. The processes of resonance formation, spontaneous decay, collisional dissociation, and stabilization by bath gas (Ar) are all characterized and taken into account within the steady-state approximation for kinetics. The focus is on stabilization step, where the mysterious isotopic η-effect was thought to originate from. Our results indicate no difference in cross sections for stabilization of scattering resonances in symmetric and asymmetric isotopomers. As practical results, the general and simple analytic models for stabilization and dissociation cross sections are presented, which can be applied to resonances in any ozone molecule, symmetric or asymmetric, singly or doubly substituted. Present calculations show some isotope effect that looks similar to the experimentally observed η-effect, and the origin of this phenomenon is in the rates of formation/decay of scattering resonances, determined by their widths, that are somewhat larger in asymmetric isotopomers than in their symmetric analogues. However, the approximate two-dimensional model used here is insufficient for consistent and reliable description of all features of the isotopic effect in ozone. Calculations using an accurate 3D model are still needed. Published by AIP Publishing. [http://dx

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“…However, this interpretation has been challenged, and fast isotopic exchange reactions involving 18 O enriched molecular oxygen ( 16 O 18 O) have to be considered as well. 21,22 …”

Section: Introductionmentioning

confidence: 99%

On the electron-induced isotope fractionation in low temperature³²O₂/³⁶O₂ices—ozone as a case study

Sivaraman

Mebel

Mason

et al. 2011

Phys. Chem. Chem. Phys.

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Such studies on the formation of distinct ozone isotopomers and isotopologues involving non-thermal, non-equilibrium chemistry by irradiation of oxygen ices with high energy electrons, as present in the magnetosphere of the giant planets Jupiter and Saturn, may suggest that similar mechanisms may contribute to the 18 O enrichment on the icy satellites of Jupiter and Saturn such as Ganymede, Rhea, and Dione. In such a Solar System environment, energetic particles from the magnetospheres of the giant planets may induce non-equilibrium reactions of suprathermal and/or electronically excited atoms under conditions, which are quite distinct from isotopic enrichments found in classical, thermal gas phase reactions.

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Relative formation rates of O350 and O352 in O16–18O mixtures

Cited by 102 publications

References 19 publications

Modelling the budget of middle atmospheric water vapour isotopes

Modelling the budget of middle atmospheric water vapour isotopes

On stabilization of scattering resonances in recombination reaction that forms ozone

On the electron-induced isotope fractionation in low temperature³²O₂/³⁶O₂ices—ozone as a case study

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Relative formation rates of O350 and O352 in O16–18O mixtures

Cited by 102 publications

References 19 publications

Modelling the budget of middle atmospheric water vapour isotopes

Modelling the budget of middle atmospheric water vapour isotopes

On stabilization of scattering resonances in recombination reaction that forms ozone

On the electron-induced isotope fractionation in low temperature32O2/36O2ices—ozone as a case study

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Product

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On the electron-induced isotope fractionation in low temperature³²O₂/³⁶O₂ices—ozone as a case study