Reactions of N(2 2D) and N(2 2P) with H2 and D2

Abstract

Rate constants for the reactions N(2 ²D)+ H₂(D₂) and N(2 ²P)+ H₂(D₂) have been measured by employing a pulse radiolysis–resonance absorption technique at temperatures between 213 and 300 K. The rate constants were expressed by the following Arrhenius equations: k_N(²D)+H2= 4.6 × 10^–11 exp(–8.8 × 10²/T), k_N(²D)+D2= 3.9 × 10^–11 exp(–9.7 × 10²/T), k_N(²P)+H2= 3.5 × 10^–13 exp(–9.6 × 10²/T) and k_N(²P)+D2= 1.9 × 10^–13 exp(–9.2 × 10²/T), in units of cm³ s^–1. The results for N(²P) suggest that the main exit channels are not chemical reactions to produce NH (ND) radicals. The Arrhenius parameters for N(²D)+ H₂(D₂) are compared with the results of transition-state theoretical calculations as well as those of quasiclassical trajectory calculations on the basis of extended LEPS potential-energy surfaces.