IV. On the spark spectrum of argon as it appears in the spark spectrum of air

Abstract

The spark spectrum of air as photographed, mapped, and described by Hartley and Adeney contains various lines which they have not been able to attribute to oxygen or to nitrogen, having no grounds for assigning them to one element or the other. The lines belonging to oxygen and nitrogen, when produced by uncondensed sparks, are comparatively well known; so also are the lines of oxygen when a condensed spark is used, but it is otherwise with the lines of nitrogen when the spark is condensed.