Chemical Reactions of NCl(a-1 Delta): Generation and Removal

The Cl N3 reaction was used to provide a source of NCla-1 Delta molecules in a room temperature flow reactor. The total quenching rate constants were measured for 40 molecular reagent species and for F, N, O and H atoms. In most cases, rate constants were obtained for both NFa-1 Delta and NCla-1 Delta so that the data could be confirmed by comparison with earlier studies of NFa-1 Delta. The quenching rate constants for NCla-1 Delta range from 1 x 10exp -15 to 4 x 10exp -11cu cm molecules. Except for H, F, O, CH3Cl, HBr, HCl and HI, the rate constants for the NCla-1 Delta molecule are generally smaller than or comparable to those for NFa-1 Delta, and NCla-1 Delata is not especially reactive at 300 K. Small rate constants were obtained for common gases, such as H2, CO2 and CH4 the rate constants are larger for unsaturated hydrocarbons and they increase with the number of carbon atoms in the molecule. A correlation was found between the basicity of a series of amines and the magnitudes of quenching rate constants of NFa-1 Delta and NCla-1 Delta the rate constants for NCla were smaller than for NFa indicating a less acidic nature for NCla-1 Delta.