Atmospheric Chemistry of Cyclohexane: UV Spectra of c-C₆H₁₁^. and (c-C₆H₁₁)O₂^. Radicals, Kinetics of the Reactions of (c-C₆H₁₁)O₂^. Radicals with NO and NO₂, and the Fate of the Alkoxy Radical (c-C₆H₁₁)O^.

TY - JOUR

T1 - Atmospheric Chemistry of Cyclohexane

T2 - UV Spectra of c-C6H11. and (c-C6H11)O2. Radicals, Kinetics of the Reactions of (c-C6H11)O2. Radicals with NO and NO2, and the Fate of the Alkoxy Radical (c-C6H11)O.

AU - Platz, J.

AU - Sehested, J.

AU - Nielsen, O. J.

AU - Wallington, T. J.

PY - 1999/12/1

Y1 - 1999/12/1

N2 - pulse radiolysis technique was used to measure the UV absorption spectra of c-C6H11. and (c-C6H11)O2. radicals over the ranges 230-290 and 220-300 nm, σ(c-C6H11.)250nm = (7.0 ± 0.8) × 10-18 and σ((cC6H11)O2.)250 nm = (5.7 ± 0.6) × 10-18 cm2 molecule-1. The rate constant for the self-reaction of c-C6H11. radicals was k3 = (3.0 ± 0.4) × 10-11 cm3 molecule-1 s-1. The addition reaction of c-C6H11. radicals with O2 proceeds with a rate constant k2 = (1-3 ± 0.2) × 10-11 cm3 molecule-1 s-1. Rate constants for reactions of (c-C6H11)O2 radicals with NO and NO2 were k4 = (6.7 ± 0.9) × 10-12 and k5 = (9.5 ± 1.5) × 10-12 cm3 molecule-1 s-1, respectively. FTIR-smog chamber techniques were used to record the IR spectrum of the peroxynitrate (c-C6H11)O2NO2, determine that the reaction between (c-C6H11)O2. radicals and NO produces a (16 ± 4)% yield of the nitrate (c-C6H11)ONO2, and study the atmospheric fate of cyclohexoxy radicals. Decomposition via C-C bond scission and reaction with O2 are competing fates of the cyclohexoxy radical. In 700-750 Torr total pressure at 296 ± 2K, the rate constant ratio kdecomp/kO2 = (8.1 ± 1.5) × 1018 molecule cm-3. At 296 K in 1 atm of air, 61% of cyclohexoxy radicals decompose and 39% react with O2. These results are discussed with respect to the literature data concerning the atmospheric chemistry of cyclohexane and analogous compounds.

AB - pulse radiolysis technique was used to measure the UV absorption spectra of c-C6H11. and (c-C6H11)O2. radicals over the ranges 230-290 and 220-300 nm, σ(c-C6H11.)250nm = (7.0 ± 0.8) × 10-18 and σ((cC6H11)O2.)250 nm = (5.7 ± 0.6) × 10-18 cm2 molecule-1. The rate constant for the self-reaction of c-C6H11. radicals was k3 = (3.0 ± 0.4) × 10-11 cm3 molecule-1 s-1. The addition reaction of c-C6H11. radicals with O2 proceeds with a rate constant k2 = (1-3 ± 0.2) × 10-11 cm3 molecule-1 s-1. Rate constants for reactions of (c-C6H11)O2 radicals with NO and NO2 were k4 = (6.7 ± 0.9) × 10-12 and k5 = (9.5 ± 1.5) × 10-12 cm3 molecule-1 s-1, respectively. FTIR-smog chamber techniques were used to record the IR spectrum of the peroxynitrate (c-C6H11)O2NO2, determine that the reaction between (c-C6H11)O2. radicals and NO produces a (16 ± 4)% yield of the nitrate (c-C6H11)ONO2, and study the atmospheric fate of cyclohexoxy radicals. Decomposition via C-C bond scission and reaction with O2 are competing fates of the cyclohexoxy radical. In 700-750 Torr total pressure at 296 ± 2K, the rate constant ratio kdecomp/kO2 = (8.1 ± 1.5) × 1018 molecule cm-3. At 296 K in 1 atm of air, 61% of cyclohexoxy radicals decompose and 39% react with O2. These results are discussed with respect to the literature data concerning the atmospheric chemistry of cyclohexane and analogous compounds.

UR - http://www.scopus.com/inward/record.url?scp=0000826822&partnerID=8YFLogxK

M3 - Journal article

AN - SCOPUS:0000826822

SN - 1089-5639

VL - 103

SP - 2688

EP - 2695

JO - Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory

JF - Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory

IS - 15

ER -