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| - High-Temperature Thermal Decomposition of Benzyl Radicals
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| - The thermal decomposition of the benzyl radical was studied in shock tube experiments using ultravioletlaser absorption at 266 nm for detection of benzyl. Test gas mixtures of 50 and 100 ppm of benzyl iodidedilute in argon were heated in reflected shock waves to temperatures ranging from 1430 to 1730 K at totalpressures around 1.5 bar. The temporal behavior of the 266 nm absorption allowed for determination of thebenzyl absorption cross-section at 266 nm and the rate coefficient for benzyl decomposition, C6H5CH2 →C7H6 + H. The rate coefficient for benzyl decomposition at 1.5 bar can be described using a two-parameterArrhenius expression by k1(T) = 8.20 × 1014 exp(−40 600 K/T) [s-1], and the benzyl absorption cross-section at 266 nm was determined to be σbenzyl = 1.9 × 10-17 cm2 molecule-1 with no discernible temperaturedependence over the temperature range of the experiments.
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