HCN Infrared Chemiluminescence from H + ICN Reaction

Article abstract of DOI:10.1021/j100164a006

The title reaction has been studied in a flowing afterglow reactor at 0.5 Torr of Ar using infrared chemiluminescence.The HCN (ν₁, ν₂, ν₃) vibrational distribution was determined by simulating the observed emission spectrum using known vibrational-rotational constants.Due to the strong overlap between several bands, it was possible to fit the experimental spectrum with different combinations of bending and CH stretch quanta.But, the y> for the different distributions was always about 0.6.The favored distribution in ν₃ is inverted extending to υ₃ = 4, with several quanta in the bending mode.The total HCN emission intensity observed from H + ICN reaction was compared with that of HCl from H + Cl2 reaction under identical conditions, and a 300 K rate constant for HCN formation of (2.0 +/- 0.4)*10^-12 cm³ s^-1 was assigned.Weak emission from ν₃ of HNC was also observed, probably arising from a minor channel leading to HNC + I.