Chemical Generation of Electronically Excited N₂ in the H(D) + NF₂ Flame


The chemistry of the H(D) + NF2 flame has been investigated through measurements of key population profiles, production efficiencies, and rate coefficients. The absolute population profiles of N2(B), NF(a), and NF(b) and upper limits on N2(A) concentrations generated in the H(D) + NF2 system are reported. From these profiles the efficiencies of NF(a) and N2(A) and N2(B) production were determined. For NF(a) the peak concentrations, which should also represent the production efficiency, were found to be 15-30% of the input NF2. From the results of measurements by other investigators on the branching ratio for the H + NF2 reaction, we would have expected the peak [NF(a)] to be ∼90% of the input NF2. Relative to N2F4, the N2(B) production efficiencies were 2-4%. However, relative to peak [NF(a)] they were 20-30%. The upper limits on [N2(A)] are consistent with N2(A) production by radiative cascading from N2(B). The room-temperature rate constant for the reaction N(2D) + NF(a) → F + N2(B,W) was estimated to be 1 × 10-10 cm3 s-1. The quenching of N2(A) by H atoms was found to have a rate constant > 5 × 10-12 cm3 s-1 and, as such, represents a major loss channel for N2(A). © 1988 American Chemical Society.



Document Type

Article - Journal

Document Version


File Type





© 1988 American Chemical Society (ACS), All rights reserved.

Publication Date

01 Jan 1988