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Rate constants for the reactions of OH radicals with CH3OCF2CF3, CH3OCF2CF2CF3, and CH3OCF(CF3)2

โœ Scribed by K. Tokuhashi; A. Takahashi; M. Kaise; S. Kondo; A. Sekiya; S. Yamashita; H. Ito

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
133 KB
Volume
31
Category
Article
ISSN
0538-8066

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โœฆ Synopsis

The rate constants for the reactions of OH radicals with CH 3 OCF 2 CF 3 , CH 3 OCF 2 CF 2 CF 3 , and CH 3 OCF(CF 3 ) 2 have been measured over the temperature range 250-430 K. Kinetic measurements have been carried out using the flash photolysis, laser photolysis, and discharge flow methods combined respectively with the laser induced fluorescence technique. The influence of impurities in the samples was investigated by using gas-chromatography. The following Arrhenius expressions were determined: ฯฉ0.90 k(CH OCF CF ) ฯญ (1.90 ) ฯซ 3 2 3 ฯช0.61 exp[ฯช(1510 ฯฎ 120)/T], exp[ฯช(1540 ฯฎ 80)/T], and ฯช12 ฯฉ0.58 ฯช12 10 k(CH OCF CF CF ) ฯญ (2.06 ) ฯซ 10 3 2 2 3 ฯช0.45 exp[ฯช(1450 ฯฎ 70)/T] cm 3 แญง 1999 John ฯฉ0.48 ฯช12 ฯช1 ฯช1 k(CH OCF(CF ) ) ฯญ (1.94 ) ฯซ 10 molecule s . 3 3 2 ฯช0.38

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