Abstract
Pulse radiolysis, discharge flash photolysis, and laser flash photolysis have been employed to study the recombination reaction H + benzyl {yields} toluene at room temperature. Both H atoms and benzyl radicals were monitored. The same reaction was studied directly in shock waves between 1,300 and 1.650 K. The value of the high-pressure recombination rate constant of (2.5 {plus minus} 0.8) {times} 10{sup 14} cm{sup 3} mol{sup {minus}1} s{sup {minus}1} was found to be independent of the temperature between 300 and 1,650 K. It is argued that high-pressure rate constants for other recombination reactions should also have very small temperature coefficients over wide temperature ranges. Room temperature rate constants for addition of H atoms to toluene, cycloheptatriene, p-xylene, benzene, phenyl, and p-methylbenzyl are also reported.
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