The spark spectrum of cerium, when excited by a very intense discharge, shows in the near ultra-violet many strong lines not found in the arc spectrum, in which the lines of Ce ii are prominent. The writers have measured 280 lines of this character from X 2167 to X 3544 and noted their intensity and degree of diffuseness. These spark lines probably belong for the most part to doubly ionized cerium, although 5 of the lines measured have previously been ascribed to Ce iv
No takes yet. Share an insight, caveat, or question.
King et al. (1932) studied this question.