Fluorescence Spectrum of PrCl3 and the Levels of the Pr+++ Ion

Abstract

PrCl₃ shows strong fluorescence from the ³P₀, ³P₁, and ¹D levels to all low‐lying levels of the Pr⁺⁺⁺ ion (³H, ³F, ¹G). This makes it possible to obtain all multiplet components of ³H and ³F. Previously unreported lines in the absorption spectrum are interpreted as transitions to the hitherto unknown ¹I₆. Zeeman effect data corroborate this. All levels to be expected from a 4f² configuration are now known for PrCl₃ except ¹S₀ which should give a line in a different part of the spectrum.