title: Product channels of the CN + HCNO reaction.
abstract: The kinetics of the reaction of CN radical with fulminic acid (HCNO) was studied by transient infrared absorption spectroscopy with the primary goal of resolving whether the dominant product channel is NO + HCCN (1a) or HCN + NCO (1b). HCN, HCCN, and NO reaction products were directly detected. In some experiments, (15)N(18)O reagent was included in the reaction mixtures in order to suppress possible secondary chemistry due to NCO radicals. Several other possible secondary reactions were also investigated and found to be very slow. The resulting product branching fractions of φ(1a) = 0.98 ± 0.07 for NO + HCCN and φ(1b) ≤ 0.07 for HCN + NCO, respectively, were obtained at 298 K. The potential energy surface (PES) of the reaction was calculated by ab initio methods at several levels of coupled-cluster theory. The calculations show pathways to channels (1a) and (1b) with nearly identical energetics and a substantial dependence on the level of theory used, suggesting that multireference calculations are needed to accurately predict the experimental results.
authors.affiliation: Department of Chemistry and Biochemistry, North Dakota State University, Department 2735, P.O. Box 6050, Fargo, North Dakota 58108-6050, USA.
authors.forename: Wenhui
authors.initials: W
authors.lastname: Feng
authors.forename: John F
authors.initials: JF
authors.lastname: Hershberger