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The reactions of hydrogen atoms with phenyl radicals, H + C 6 H 5  → products (1), and with benzene, H + C 6 H 6  → products (2), have been studied behind reflected shock waves in the temperature range 1200–1350 K with argon as the bathgas. H-atom resonance absorption spectrometry at 121.6 nm was used as detection technique. Hydrogen atoms and phenyl radicalswere produced by thermal decomposition of C 2 H 5 I and C 6 H 5 I, respectively. Low initial concentrations (~10 12 –10 15  cm -3 ) were employed to suppress consecutive bimolecular reactions as far as possible.The rate coefficients were determined from fits of the H atom concentration-time profiles in terms of a small mechanism. Forreaction (1), a temperature-independent rate coefficient  k  1    = 1.3×10 –10  cm 3  s –1  was obtained at pressures around 1.3 bar. For the rate coefficient of reaction (2), the temperature dependence can be expressedas  k  2 ( T )   = 5.8×10 –10  exp(–8107 K/ T ) cm 3  s –1 , and a pressure dependence was not observed between 1.3 and 4.3 bar. The uncertainties of  k  1  and  k  2  were estimated to be ±40%.

Shock-Tube Study of the Reactions of Hydrogen Atoms with Benzene and Phenyl Radicals