Kinetics of the peroxy RFO2 radical formation in the RHF-O2-CO2 gaseous mixtures

A. Jowko; K. Wnorowski; K. Wojciechowski

doi:10.1007/s10967-007-7007-4

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 275: Issue 1

Kinetics of the peroxy RFO₂ radical formation in the RHF-O₂-CO₂ gaseous mixtures

Authors:

A. Jowko

A. Jowko University of Podlasie Department of Chemistry Maja 54 08-110 Siedlce 3 Poland

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K. Wnorowski

K. Wnorowski University of Podlasie Department of Chemistry Maja 54 08-110 Siedlce 3 Poland

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, and

K. Wojciechowski

K. Wojciechowski University of Podlasie Department of Chemistry Maja 54 08-110 Siedlce 3 Poland

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Pages:: 201–207

Online Publication Date:: 06 Sep 2007

Publication Date:: 01 Jan 2008

Article Category:: Research Article

DOI:: https://doi.org/10.1007/s10967-007-7007-4

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Abstract

The kinetic data on the molecular oxygen activity of CH₃CH^·, CH₃CF₂^· and CF₃CHF^· radicals are reported. In laboratory, these radicals were generated by pulsed (12 ns) electron beam interaction with the gaseous RHF-O₂-CO₂ mixtures containing large excess of carbon dioxide (RHF = CH₃CH₂F, CH₃CHF₂ or CH₂FCF₃). The transient product (O₃ or RFO₂^·) formation was monitored by the UV absorptions at 250 nm and the rate constants of Reactions (4) and (9) were obtained. The values of k₉ diminished with increasing number of fluorine atoms in RHF molecule. For CH₃CH₂F and CH₃CHF₂ the k₉’s were equal to (8.8–10.2)^·10⁻¹⁴cm³^·s⁻¹ and (7.3–8.4)^·10⁻¹⁴cm³^·s⁻¹, respectively, and seem to be determined for the first time. In the case of CH₂FCF₃ the obtained value of k_CF3CHF+O2 = 5.20±0.76^·10⁻¹⁴cm³^·s⁻¹ is much higher than the value published in the literature.⁴ The other determined rate constant data are comparable to the literature values.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)