Abstract

A modification of a method developed by Weber and Teale is described which permits determination of fluorescence yields upon excitation to narrow, atomic energy levels. This is applied to solutions of Eu(NO₃)₃ · 6H₂O in CH₃OH and Eu(NO₃)₃ in CH₃OD. Upper europic ion levels (⁵D₀, ⁵D₁, ⁵D₂, ⁵D₃ and ⁵L₇) are individually excited and the emission from the ⁵D₀ level is observed. Results show that (a) fluorescence yields are higher in the CH₃OD than in the CH₃OH solution, (b) the probabilities of populating the ⁵D₀ level from higher-lying levels are less than unity, and (c) these probabilities are nearly equal in the CH₃OH and CH₃OD solutions.

© 1965 Optical Society of America

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