Third-order recombination reactions of NF2 radicals

Abstract

The kinetics of elementary reactions of ground state NF₂ radicals, produced by thermal dissociation of N₂F₄ in a low pressure flow system, were investigated at 293 K. The third order reaction (1) was characterized: NF₂+ NF₂+ M [graphic omitted] N₂F₄+ M;(1) values for k_1,M(10^–32 cm⁶ molecule^–2 s^–1) at 293 K were: k_1,Ar=(1.2₆± 0.1₅); k_1,He=(0.7₆± 0.1₅); k_1,SF6=(2.9₃± 0.3₀); k_{1, 02}=(0.9₈± 0.1₈).

Reactions of Cl and Br ²P_frac32; atoms with NF₂ radicals in Ar carrier gas were also third order: NF₂+ Cl + Ar [graphic omitted] NF₂Cl + Ar; NF₂+ Br + Ar [graphic omitted] NF₂Br + Ar. At 293 K, k_2,Ar=(2.7 ± 0.4)×10^–31, k_3,Ar=(1.0 ± 0.2)× 10^–31 cm⁶ molecule ^–2 s^–1. Second order rate constants at 293 K for the reactions NF₂Cl + Cl, NF₂Br + Br, were > 2 × 10^–14 cm³ molecule^–1 s^–1. The stabilities of NF₂Cl and NF₂Br are discussed.