CIII. An effect of argon on the first positive band spectrum of nitrogen

Abstract

Traces of nitrogen in high-pressure argon show the first positive band spectrum in a considerably modified form. This consists in a selection of a few only of the band heads of the various groups, and the general effect is similar to that found in the afterglow specturm. Quantitative investigations are described which indicate that there is an energy displacement towards the more refrangible end of each band group. This also is similar to the conditions of the afterglow. It is suggested that all the phenomena hitherto regarded as peculiar to the electrical conditions obtaining in the afterglow may be reproduced in high-pressure argon. The bearing of these facts on the nature of the afterglow spectrum is discussed.