Kinetics of the Gas‐Phase Reaction of NO₃ Radicals with 1‐Butene, <i>trans</i>‐Butene, 2‐Methyl‐2‐butene and 2,3‐Dimethyl‐2‐butene Using LIF Detection

Abstract

Abstract Rate constants for the gas‐phase reaction of NO 3 radicals with 1‐butene, trans ‐butene, 2‐methyl‐2‐butene and 2,3‐dimethyl‐2‐butene have been obtained in a flow system at 298±2 K and a pressure of 3 mbar He using NO 3 LIF measurements. NO 3 radicals were produced via thermal decomposition of N 2 O 5 at ca. 400 K, i.e. N 2 O 5 +M → NO 3 +NO 2 +M. Applying pseudo‐first‐order conditions, the rate constants for 1‐butene and trans ‐butene were found to be (1.04±0.11)·10 −14 and (3.74±0.45)·10 −13 , respectively. For 2‐methyl‐2‐butene and 2,3‐dimethyl‐2‐butene the rate constants were obtained under second‐order conditions to be (1.03±0.09)·10 −11 and (5.49±0.42)·10 −11 , respectively (unit: cm 3 molecule −1 s 1 ).