Laboratory kinetic studies of the reactions of Cl atoms with species of biogenic origin: Delta(3)-carene, isoprene, methacrolein and methyl vinyl ketone

The rate coefficients for the reaction between atomic chlorine and a number of naturally occurring species have been measured at ambient temperature a nd atmospheric pressure using the relative rate technique. The values obtai ned were (4.0 +/- 0.8) x 10(-10), (2.1 +/- 0.5) x 10(-10), (3.2 +/- 0.5) x 10(-10), and (4.9 +/- 0.5) x 10(-10) cm(3) molecule(-1) s(-1), for reaction s with isoprene, methyl vinyl ketone, methacrolein and Delta(3)-carene, res pectively. The value obtained for isoprene compares favourably with previou sly reported values. No values have been reported to date for the rate cons tants of the other reactions.