Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 8, 2005
Previous Article Next Article

A laser photolysis–resonance fluorescence study of the reactions: I + O3 → IO + O2, O + I2 → IO + I, and I + NO2 + M → INO2 + M at 298 K

Author affiliations

Abstract

Laser flash photolysis coupled to resonance-fluorescence detection of I atoms was used to measure the rate coefficients for the reactions: I + O3 → IO + O2(R1), O + I2 → IO + I (R6) and I + NO2 + M → INO2 + M (R7). All experiments were conducted under pseudo first-order conditions, and the accuracy of the results was enhanced by online determination of reagent concentrations by optical absorption. Bimolecular rate coefficients for reactions (R1) and (R6) were determined to be k1 = (1.28 ± 0.06) × 10−12 and k6 = (1.2 ± 0.1) × 10−10 cm3 molecule−1 s−1 at 298 ± 2 K, independent of pressure. Rate coefficients for the termolecular reaction (R7), also at 298 ± 2 K, were found to be in the falloff region between 3rd and 2nd order behaviour and, when combined with other datasets obtained at higher and lower pressures, were adequately described by a simplified Troe function with the parameters: k7,0(He, 330 K) = 1.48 × 10−31 cm6 molecule−2 s−1, FC(He) = 0.43, and k7,∞ = 1.1 × 10−10 cm3 molecule−1 s−1 for He as bath gas. In N2 (or air) the following parameters were obtained k7,0(N2, 300 K) = 3.2 × 10−31 cm6 molecule−2 s−1, FC(N2) = 0.48, with k7,∞ set to 1.1 × 10−10 cm3 molecule−1 s−1 as obtained from analysis of the falloff curve obtained in He.

Graphical abstract: A laser photolysis–resonance fluorescence study of the reactions: I + O3 → IO + O2, O + I2 → IO + I, and I + NO2 + M → INO2 + M at 298 K

Back to tab navigation

Article information


Submitted
24 Feb 2005
Accepted
04 Mar 2005
First published
15 Mar 2005

Phys. Chem. Chem. Phys., 2005,7, 1657-1663
Article type
Paper

A laser photolysis–resonance fluorescence study of the reactions: I + O3 → IO + O2, O + I2 → IO + I, and I + NO2 + M → INO2 + M at 298 K

M. E. Tucceri, T. J. Dillon and J. N. Crowley, Phys. Chem. Chem. Phys., 2005, 7, 1657
DOI: 10.1039/B502844B

Social activity

Search articles by author

Spotlight

Advertisements