Selective photochemistry is indeed possible in the liquid phase and has been used in the separation of a growing number of elements, particularly the transition metals, the rare earths, and the actinides.1 Selectivity in a photochemical separation process can be obtained in either of two basic methods. One process employs the differences in the absorption spectra of a mixture of elements, where the spectral selectivity must be preserved chemically following the initial photochemical event.

© 1982 Optical Society of America

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