New Emission Bands of Forbidden Systems of Nitrogen in the Vacuum Ultraviolet Region

Abstract

Using a 2‐m vacuum spectrograph and an ordinary transformer discharge through mixtures of N₂ with argon and xenon, we observed two new systems of N₂ emission bands, one for each mixture, in the region between 1550 and 2250 A. According to the vibrational analysis, the bands, which were excited in the mixture of (N₂+A), are due to the transition ${{\mathrm{(a}}^{\prime }}^1{\Sigma }_u^{-}{\mathrm{-X}}^1{\Sigma }_g^{+})$ , and the bands, which were excited in the mixture of (N₂+Xe), are due to the transition ${(}^3{\Sigma }_u^{-}{\mathrm{-X}}^1{\Sigma }_g^{+})$ . The present results are in good agreement with those of Wilkinson and Mulliken whose observations were made for the same systems of bands in absorption.