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Low‐pressure rate coefficients of the reaction of O( 3 P) with CF 3 I and CH 3 I
Author(s) -
Teruel Mariano A.
Publication year - 2008
Publication title -
journal of physical organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.325
H-Index - 66
eISSN - 1099-1395
pISSN - 0894-3230
DOI - 10.1002/poc.1393
Subject(s) - chemistry , torr , kinetic energy , analytical chemistry (journal) , atmospheric pressure , gas phase , molecule , reaction rate constant , resonance (particle physics) , atomic physics , kinetics , thermodynamics , organic chemistry , physics , quantum mechanics , oceanography , geology
Abstract Absolute rate coefficients for the gas‐phase reactions of CF 3 I and CH 3 I with O( 3 P) atoms were measured at 298 K by the discharge flow technique coupled to resonance fluorescence to monitor O( 3 P) atoms. This is the first kinetic study for these reactions under low‐pressure conditions (1.56–3.26 Torr). The overall rate coefficients were (5.2 ± 0.7) × 10 −12 and (2.3 ± 0.3) × 10 −11 cm 3 molecule −1 s −1 , respectively. The experiments were carried out under pseudo‐first‐order conditions with [O( 3 P)] 0 ≪ [RI] 0 . The results are compared with previous measurements using different experimental techniques at higher pressures. Free energy relationships and atmospheric implications are discussed. Copyright © 2008 John Wiley & Sons, Ltd.