An experimental study of the gas-phase reaction of the NO3 radical with 1,4-pentadiene, Z-1,3-pentadiene and E-1,3-pentadiene
Abstract
Relative-rate and absolute techniques have been used to obtain rate coefficients for the reactions between the NO3 radical and 1,4-pentadiene (k1), Z-1,3-pentadiene (k2) and E-1,3-pentadiene (k3). The rate coefficients obtained by the relative-rate method at T = 300 ± 1 K and P = 759 ± 7 Torr are k1 = (2.3 ± 0.3) × 10−14 cm3 molecule−1 s−1, k2 = (2.0 ± 0.3) × 10−12 cm3 molecule−1 s−1 and k3 = (2.4 ± 0.3) × 10−12 cm3 molecule−1 s−1. The rate coefficients determined by the discharge–flow technique at low pressure (P = 1.8–4.5 Torr) and at T = 300 ± 3 K are k1 = (2.3 ± 0.6) × 10−14 cm3 molecule−1 s−1, k2 = (1.4 ± 0.4) × 10−12 cm3 molecule−1 s−1 and k3 = (1.6 ± 0.4) × 10−12 cm3 molecule−1 s−1. The authors suggest the use of the values k1 = (2.3 ± 0.5) × 10−14 cm3 molecule−1 s−1, k2 = (1.7 ± 0.4) × 10−12 cm3 molecule−1 s−1 and k3 = (2.0 ± 0.4) × 10−12 cm3 molecule−1 s−1 for atmospheric calculations.