Extinction coefficients for the β-methallyl radical

The radicals formed in the flash photolysis of 2-methylbut-1-ene and iso-butene and subsequent reactions have been investigated by kinetic spectroscopy and gas liquid chromatography. The extinction coefficients of the β-methallyl radical were measured from the absorption bands. The decay of the radical was second order. The measured rate constant for β-methallyl combination was (2.6±0.3) × 10¹⁰ mol^?1 & s^?1 at 295 ± 2K.