Kinetics of the reaction of chlorine atoms with isoprene (2-methyl 1,3-butadiene, CH_2{double bond, long}C(CH_3)CH{double bond, long}CH_2) at 297 ± 2 K

摘要

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%.