CN(A 2Πi→X 2Σ+) chemiluminescence from the N+C2N, N+CCl, and N+C2 reactions under low-pressure fast-flow conditions

The reaction of potassium atoms with C2NCl3, CCl4, and C2Cl4 have been used to produce C2N, CCl, and C2 radicals. The addition of nitrogen atoms to the products of these reactions yields CN(A 2Πi→X 2Σ+) chemiluminescence, detected from vibrational levels vA=2–16. The vibrational distribution of CN(A) are, respectively, for different reactions, similar to a statistical decrease from vA=2 to vA=14 for N+C2N, inverted with a maximum for vA=8 for N+CCl, and limited to vA=2 level for N+C2.