The 198Au βhalf-life in the metal Au⋆

For the β^--decay of ¹⁹⁸Au in a Au metallic environment the half-life was observed to be longer by 0.4±0.7% at room temperature (T = 293K) and by 4.0±0.7% when the metal was cooled to T = 12K, both compared to the literature value of T _1/2 = 2.6943±0.0008d.     

Tunneling spectroscopy of electron space charge layers on (111)-Si

MgSiO₂Si tunnel junctions were prepared on nondegenerate substrates in a planar structure. By suitable technology-steps a low-resistance connection between the diffused drain contact and an electron enhancement channel, which was generated by the work function difference of the electrodes and charged defects in the barrier region, can be realized; therefore low-temperature measurements of the current-voltage characteristic and its derivatives were possible. In the $\text{d}{}^2\text{I}\text{dU}{}^2$ vs. U-traces various structures have been observed, which were caused by band edge effects of numerous surface subbands, by phonon-assisted tunneling and by a zero-bias anomaly. At nearly constant surface charge density the energy separation of the subbands and its dependence on depletion charge density, varied by the application of a substrate bias, has been measured. Because of the direct reading of the subband energies relative to the Fermi-level the surface density could be estimated.     

Die Chloridionenaffinitäten von Akzeptorchloriden in Acetonitril, 1. Mitt.: Lösungszustand und Bildungsgleichgewichte der Triphenylchlormethankomplexe

Zusammenfassung Triphenylchlormethan ionisiert in Acetonitril nicht; mit Akzeptorchloriden bildet es Koordinationsverbindungen, die unabhängig von Akzeptor und Lösungsmittel das [Ph₃C]⁺-Ion in derselben nichtsolvatisierten Form enthalten. Dabei bilden Di-, Tri- und Pentachloride bei einfacher Koordination einkernige, Tetrachloride bei einfacher Koordination zweikernige oder bei zweifacher Koordination einkernige Komplexe. Eine Dissoziation der Ionenpaare tritt nicht in erwartetem Umfang auf. Die Bildungskonstanten werden berechnet und ihre Vergleichbarkeit diskutiert.Mit 7 Abbildungen     

Die Bildungsenthalpie der Tellurtetrahalogenide

The Enthalpy of Formation for TeX₄ The enthalpies of formation were derived for the tetrahalogenides TeCl₄, TeBr₄, and TeJ₄ from the enthalpy of solution in KOH. The determination based on the enthalpy of formation for TeO₂ and the KX and their enthalpy of solution in KOH. Results see ?Inhaltsübersicht”?.     

Meßanordnung zur Untersuchung der Radiothermolumineszenz von Polymeren

In the present work, an appliance for the measurement of the radiothermoluminescence of thin polymer layers irradiated at a temperature T = 80 K is described. The design of the electron beam source used for the irradiation as well as of both the cooling and the healing systems is presented in detail.

An electrode system of oscillograph tubes is used as an election source yielding flux density I ≥ 10^?6 A/cm² with electron energy being variable from 5 keV to 25 keV. The appliance offers particular advantage by the aggregation of irradiation source, sample holder and SEV, rendering possible measurement of isothermal luminescence at low temperature immediately after irradiation.