Abstract
Rate coefficients are reported for the gas-phase reaction of the hydroxyl radical (OH) with C2Cl4 (k1) over an extended temperature range at 740 ± 10 Torr in a He bath gas. These absolute rate measurements were conducted using a laser photolysis/laser-induced fluorescence (LP/LIF) technique under slow flow conditions. The lower temperature values for k1 are within ±2σ of previous data using different techniques. The overall slope of our Arrhenius plot varies slightly from previously reported values. Agreement within our own data holds up to ∼720 K, but reliable measurement beyond this temperature was hampered by apparent thermal decomposition of our OH source (HONO). An Arrhenius fit to the data yielded the expression k1(T) = (1.68 ± 0.25) × 10-12 exp(−764.2 ± 79.1/T), whereas a three-parameter Arrhenius fit yielded the expression k1(T) = (1.93 ± 0.20) × 10-22(T)3.2 exp(660.8 ± 54.6/T), where k is in units of cm3 molecule-1 s-1. This work shows some deviation from previous low-temperature data. We propose...
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