Elektrodenanordnung zur Messung des Hall-Effekts an hochohmigen Halbleitern

For measurements of the Hall-effect of high-ohmic samples a new arrangement of electrodes is given which keeps the resistance between the Hall-electrodes small. This method permits to determine the concentration of charge carriers in semiconductors which have mobilities much lower than 1 cm²/Vs. The usefulness of the method is tested for some solids.     

Lichtausbeute von Anthrazen bei Beschuß mit α-Teilchen bei Channeling

Luminescent response of anthracene to channeled α-particles transmitted parallel to the [001]-axis is investigated. A simple theoretical model is presented and comparisons made with experiment. For a given specific energy lossdE/dx the luminescent response to channeled α-particles is the same as to randomly incident particles. This result is concluded from the good agreement of theoretical calculations and experimental measurements within the accuracy of about ± 3%. The relationship between specific luminescencedS/dx of anthracene and specific energy lossdE/dx is used for the calculations. It is obtained by fitting experimental values to the theoretical expression.     

Zur Labyrinthstruktur bei Martensit

Ohne Zusammenfassung

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