The band spectrum of N2: weak systems in the visible region

Abstract

The spectrum of N2 produced by mild excitation with a silent, ozonizer-type discharge, and with a Tesla coil has been studied. The Goldstein-Kaplan bands at λλ4165, 4432 and 4728 appear readily and photographs and measurements made with large dispersion are presented. The measurements support Kaplan's vibrational analysis for these bands, but it is believed that other bands in the ultra-violet belong to a different system. The rotational structure and probable type of electronic transition are discussed. A weak new system of bands in the Green has been observed. A provisional analysis gives ω½'=896, ω½double prime=740 cm.-1. The electronic levels of N2, the effect of excitation conditions on the band systems of N2, and the bearing of the results on the determination of the dissociation energy are discussed.