Two photoionization thresholds of N_3 produced by CIN_3 photodissociation at 248 nm:Further evidence for cyclic N_3

摘要

We present results of near-threshold photoionization of N_3 photofragments produced by laser photodissociation of C1N_3 at 248 nm.The time of flight of recoiling N_3 is used to resolve two photochemical channels producing N_3,which exhibit different translational energy release.The two forms of N_3 resolved in this way exhibit different photoionization thresholds,consistent with their assignment to linear(X~1PI_g)and cyclic N_3.This result agrees with the existing theoretical calculations of excited and ionic states of N_3 and strengthens previous experimental results which suggested that the C1N_3 photolysis produces a cyclic form of N_3.