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

Relative-rate and absolute techniques have been used to obtain rate coefficients for the reactions between the NO3 radical and 1,4-pentadiene (k(1)), Z-1,3-pentadiene (k(2)) and E-1,3-pentadiene (k(3)). The rate coefficients obtained by the relative-rate method at T = 300 +/- 1 K and P = 759 +/- 7 Torr are k(1) = (2.3 +/- 0.3) x 10(-14) cm(3) molecule(-1) s(-1), k(2) = (2.0 +/- 0.3) x 10(-12) cm(3) molecule(-1) s(-1) and k(3) = ( 2.4 +/- 0.3) x 10(-12) cm(3) 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 k(1) = (2.3 +/- 0.6) x 10(-14) cm(3) molecule(-1) s(-1), k(2) = (1.4 +/- 0.4) x 10(-12) cm(3) molecule(-1) s(-1) and k(3) = (1.6 +/- 0.4) x 10(-12) cm(3) molecule(-1) s(-1). The authors suggest the use of the values k(1) = (2.3 +/- 0.5) x 10(-14) cm(3) molecule(-1) s(-1), k(2) = (1.7 +/- 0.4) x 10(-12) cm(3) molecule(-1) s(-1) and k(3) = (2.0 +/- 0.4) x 10(-12) cm(3) molecule(-1) s(-1) for atmospheric calculations.