CN(A(2)Pi(i) -> X-2 Sigma(+)) chemiluminescence from the N+C2N, N+CCl, andN+C-2 reactions under low-pressure fast-flow conditions

The reaction of potassium atoms with C2NCl3, CCl4, and C2Cl4, have been use d to produce C2N, CCl, and C-2 radicals. The addition of nitrogen atoms to the products of these reactions yields CN(A (II)-I-2 --> X(2)Sigma(+)) chem iluminescence, detected from vibrational levels nu(A) = 2-16. The vibration al distribution of CN(A) are, respectively, for different reactions, simila r to a statistical decrease from nu(A) = 2 to nu(A) = 14 for N + C2N, inver ted with a maximum for nu(A) = 8 for N + CCl, and limited to v(A) = 2 level for N + C-2. (C) 2000 Elsevier Science B.V. All rights reserved.