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Laser activity has been obtained from terbium tris (1, 1, 1-trifluoroacetylacetonate) at room temperature in a liquid solution in acetonitrile and in p-dioxane. Threshold pumping energy is about 1700 J. Characteristic line narrowing, spiking and beam collimation was exhibited.

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The emission spectra of two dipyridyl complexes of EuCl3 were analyzed in detail treating the ligand field as a perturbation on the free-ion levels. The ligand-field parameters were calculated from the splitting in the F71 and F72 levels of the Eu3 + ion without assuming a known molecular geometry and the model suggested by these parameters is discussed. In addition, the ligand-field parameters are used to calculate interatomic distances and to compare the coordinative properties of water and dipyridyl ligands. The method developed for deriving and verifying the geometrical arrangement and interatomic distances from fluorescence spectra proves to be a powerful tool.