The Spectrum of Doubly Ionized Carbon,CIII

Abstract

With new experimental data 54 lines of ${\mathrm{C}}_{\mathrm{III}}$ have been classified. A large number of these lines involve terms in which both valence electrons are excited. The ionization potential deduced from this classification is 47.7 volts. The classification of a few additional ${\mathrm{C}}_{\mathrm{II}}$ lines is also given. These analyses fix the relative position of the singlets and triplets in ${\mathrm{C}}_{\mathrm{III}}$ and the doublets and quartets in ${\mathrm{C}}_{\mathrm{II}}$.