Abstract

The spectrum of ${\text{N}}_2^{+}$ has been and still is the subject of many investigations, mainly because of the role this ion plays in electric discharge plasmas, and atmospheric phenomena. Optical diagnostics and radiative modeling require accurate spectroscopic data (wavenumbers, molecular constants, transition probabilities) to predict the radiation of air, for example in the re-entry of spaces vehicles in the earth's atmosphere. A comparison between the experimental spectrum and a numerical simulation shows important disagreements when the perturbations are not modeled (1). The aim of the present work is to carry out a more complete deperturbation of the strongly perturbed ${\text{N}}_2^{+}$ first negative system ${\text{B}}^2{\Sigma }_{\text{u}}^{+}\to {\text{X}}^2{\Sigma }_{\text{g}}^{+}$. Line shifts of several cm^-1 can be observed.

© 1995 Optical Society of America