Über den Nachweis einiger flüchtiger Amine im Hinblick auf die Untersuchung biologischer Vorgänge

Ohne ZusammenfassungHerrn DirektorPatzau, durch dessen materielle Unterstützung diese Arbeit wesentlich gefördert wurde, Sagen wir unseren besten Dank.     

Beweise der Anordnungsaxiome im Rahmen der synthetischen Geometrie

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Zur Trennung des Zinns und des Titans

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Bemerkungen zum Aufsatze des H. Rulf: „Über die Entfernung einer Unstetigkeit in der Geometrie.”

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Deposition and Characterization of Metastable Cu3N Layers for Applications in Optical Data Storage

 Cu₃N films for optical data storage were deposited on Si(100) wafers and 0.6 mm thick polycarbonate DVD base material discs at a temperature of 50 °C by reactive magnetron sputtering. A copper target was sputtered in rf mode in a nitrogen plasma. For basic investigations concerning the composition and structure of Cu₃N, Si wafers were used as substrate material. To study the suitability of Cu₃N as an optical data storage medium under technical conditions, Cu₃N/Al bilayers were deposited on polycarbonate discs. The composition and structure of the films were investigated by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The decomposition of Cu₃N into metallic copper and nitrogen was induced and characterized with a dynamic tester consisting of an optical microscope with an integrated high power laser diode. The change in reflectivity induced by the laser pulses was measured by a high sensitivity photo detector. Optimized Cu₃N films could be decomposed into metallic copper at pulse lengths of 200 ns. The reflectivity change from 3.2% to 33.2% for completely transformed areas and to 12% for single bits as well as the maximum write data rate of 3.3 Mbit/s demonstrated the suitability of Cu₃N for write once optical data storage. Especially the carrier to noise ratio of 41 dB shows an increase of a factor of 3 for this novel material as compared to conventional optical data storage media.     

Die Wärmeabsorptionsfähigkeit von Gasgemischen

Analytical and Bioanalytical Chemistry -