Kinetics of the reaction of chlorine atoms with isoprene (2-methyl 1,3-butadiene, CH 2[dbnd]C(CH 3)CH [dbnd]CH 2) at 297 ± 2 K

Abstract

The gas-phase reaction of chlorine atoms with isoprene was studied in 1–20 Torr of N 2 or Ar diluents using pulsed laser photolysis/vacuum UV laser-induced fluorescence and in 1–700 Torr of N 2 diluent using smog chamber relative rate techniques. There was no discernable effect of total pressure or nature of the diluent gas indicating that even in 1 Torr of argon diluent the reaction is near its high pressure limit. A value of k(Cl + isoprene) = (3.44 ± 0.32) × 10 −10 cm 3 molecule −1 s −1 was derived and is recommended for use in atmospheric models. The molar HCl yield in 700 Torr of N 2 diluent was 12.6 ± 3.0%.