Optische Konstanten aufgedampfter Eisenschichten

Iron was heated and evaporated by electron bombardment. The condensation upon glass plates gives layers with highly reproducible thicknesses and optical constants. In the range of the visible spectrum, the constants were determined for opaque layers (thickness≧1000 Å) by the elliptical analysis of reflected light. They vary reproducibly with the conditions of preparation. The range of values covers most of the measurements published to date for iron. For oblique condensed layers the optical constants are very strongly anisotropic. Irreversible changes of the constants within the range of temperature from 150 to 400° C are presumably connected with crystalline growth.     

Optische und elektrische Erscheinungen in kupferaktivierten Natriumchloridkristallen

NaCl crystals activated with copper were prepared either from the melt or from an aqueous solution. They were coloured either photochemically or additively. The absorption, luminescence and electron emission were then measured on such crystals. The experimental results show the cause of the different results obtained by different authors and what conclusions can be drawn for the elaboration of models of luminescent centres.     

Optische Untersuchungen zum metastabilen Triplett-Zustand vonM-Zentren in KCl

M centers in alkali halides consist of twoF centers combined along one of the 〈110〉 directions of the crystal. In addition to the singlet ground state a metastable triplet state has been observed. The paper deals with the absorption and excitation spectra, the kinetics of the production and the spontaneous and the induced decay of tripletM centers in KCl.