Document Type
Article
Language
eng
Publication Date
2016
Publisher
American Institute of Physics
Source Publication
Journal of Chemical Physics
Source ISSN
0021-9606
Original Item ID
DOI: 10.1063/1.4945779
Abstract
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.
Recommended Citation
Ivanov, Mikhail V. and Babikov, Dmitri, "On Stabilization of Scattering Resonances in Recombination Reaction that Forms Ozone" (2016). Chemistry Faculty Research and Publications. 540.
https://epublications.marquette.edu/chem_fac/540
Comments
Published version. Journal of Chemical Physics, Vol. 144, No. 15 (2016). DOI. © 2016 American Institute of Physics. Used with permission.