The Absolute Rate Constants of Reaction of Hydrogen Atoms with Several Olefins

Using the techniques of pulse-radiolysis and of the absorption of Lyman-α radiation by hydrogen atoms, the absolute rate constants of reaction of hydrogen atoms with several olefins have been measured at room temperature. Olefin k⁄10−12 cm3 molecule−1 s−1 Ethylene 1.1±0.1 Propylene 1.7±0.1 1-Butene 2.0±0.5 trans-2-Butene 1.1±0.2 cis-2-Butene 1.0±0.1 2-Methyl-1-propene 5.2±0.6 2-Methyl-2-butene 2.4±0.3 These rate constants were invariant over hydrogen pressures ranging from 200 to 1200 Torr.