Determination of the ratio of copper(I) to copper(II) present as traces in ionic crystals

A polarographic method is described for the determination of traces of copper in ionic crystals, which also allows the determination of the ratio of the concentrations of copper(II) and copper(I).     

Die Röntgenolumineszenz der aus der Schmelze Gezüchteten Kristalle von NaCl: Fe

The X-ray luminescence of NaCl crystals with Fe(III) from the melt was studied. The conditions of the occurrence and colour of this luminescence and the luminescence centres are discussed from the point of view of the content of oxygen in crystals.

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Die Verfasser möchten Herrn RNDr. A. Bohun für seine Interesse und die Unterstützung dieser Arbeit herzlich danken. Sie danken ferner Herrn Ing. K. Polák für die Mitarbeit bei der Messung der Spektralzerlegung der Lumineszenz und Frl. H. paková und Herrn A. Cihlá für ihre wirksame Hilfe bei den technologischen Arbeiten.     

Absorption bands of lead in mixed KCl + KBr crystals

The absorption spectra of mixed KCl + KBr crystals with lead added were measured. The main attention was devoted to A bands and their fine structure. Measurements were made at different temperatures. The results are discussed from the point of view of the existence of lead complexes in crystals of alkali halides.