The A2∏u-X2∑g+ system of N2+ was first observed in auroral emissions by Meinel in 1950. Although the N2+ band system has been reinvestigated since this first spectral study, no laboratory spectrum of the 2-1 vibronic band has been obtained. We have recently built a continuous-wave cavity ringdown spectrometer, and as a first test of this spectrometer we observed the 2-1 band of N2+ in a positive column discharge cell. In the process of assigning this spectrum many lines of the first positive band system of N2* were also identified. The relative intensities of the N2* and N 2+ bands were found to change with discharge cell pressure, and so each spectral region was observed at two pressures to aid in distinguishing the spectra of the two species. We improved previous predictions of the molecular constants by obtaining a fit for both of these species and will present these results.
7:30 PM-10:00 PM, Wednesday, March 28, 2007 Hyatt Regency Chicago -- Riverside Center, Poster