Observation of N$_{4}^{+}$ recombination at near atmospheric pressure

We previously reported our initial modeling results of the N$_{4}^{+}$ + e$^{-}$ recombination observed by monitoring the time-resolved N$_{2}$ emission (GEC03, paper SRP 24). The N$_{2}$ 2nd positive (C $^{3}\Pi _{u}$ -- B $^{3}\Pi _{g})$ and N$_{2}^{+}$ 1$^{st}$ negative (B$^{2}\Sigma _{u}^{+}$-X$^{2}\Sigma _{g})$ emission was measured following laser resonance-enhanced multi-photon ionization (REMPI) of N$_{2}$ at near-atmospheric pressure. N$_{4}^{+}$ is produced by the three-body association reaction of N$_{2}^{+}$ + N$_{2}$ which occurs rapidly at these pressures. Two types of fluorescence are observed following irradiation of N$_{2}$ by the laser pulse. A ``prompt'' fluorescence composed primarily of emission from the N$_{2}^{+}$ 1$^{st}$ negative system (B $^{2}\Sigma _{u}^{+}$-X $^{2}\Sigma _{g})$ followed by a ``delayed'' fluorescence form the aforementioned N$_{2}$ (C-B). The preliminary modeling presented previously has been extended to include other key N$_{2}$ neutral and ionic species as well as the important loss channel of N$_{4}^{+}$ by laser photodissociation which had been neglected. The improved model along with additional N$_{2}^{+}$ LIF and N$_{4}^{+}$ UV photolysis results will be presented.