The absorption spectra of the alkali metals in ethylenediamine and the spectra of mixtures of various alkali metaI ions with metal solutions are reported. The absorption spectra differ markedly from one metal to another. The species responsible for the various absorption peaks are only slowly interconverted. It is concluded that three types of species are responsible for liglht absorption, and the presence or absence of any type is a characteristic of the metal. (12)

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