Haftstellenerzeugung und Leuchtmechanismus bei den Wolframat-Phosphoren

Thermoluminescence investigations of several tungstate and molybdate phosphors, excited by UV-, cathode- und X-rays, show that cathode- and X-rays are able to produce electron traps in the centres. Thus, after irradiation an amplification of the UV-light sum can be observed, and the form of the glow curves differs considerably after the various excitations. Theoretical conceptions about the trap production are confirmed quantitatively by measuring the variation of the light sum with irradiation time at various kinds of excitation. However, the produced traps influence the simple exponential decay after UV-excitation and lead to the appearance of a second exponential relation in the decay curve. These decay measurements can also be verified by theoretical considerations about the kinetics of possible transitions. It is supposed that the traps, which can be healed by annealing, are situated in the electron configuration of the tungstate complex; a model for the luminescence centre is discussed.     

Relativistisch invariante Beschreibung strukturierter Elementarteilchen

Within a dynamic theory of fusion the three-particle-system is examined. Under suitable boundary conditions a method of integra ion is developed, which yields the exact solution of the relativistic three-particle-equation. This solution describes an elementary particle with internal structure. A thorough discussion of the collective motion supplies the massM and spin 1/2 for the new particle and the proper Diracequation, so that an identification of the three-particle-system with the electron is possible.     

Die Kombinationsbeziehungen bei den Bandenspektren der Kupferflamme

Zeitschrift für Physik A Hadrons and nuclei -     

Zur Bestimmung chemischer Verschiebungen der NMR-Frequenzen bei Quadrupolkernen aus den MAS-NMR-Spektren

Determination of Chemical Shifts of NMR-Frequencies of Quadrupolar Nuclei from the MAS-NMR Spectra The general expressions for the NMR central transition of rotating samples with quadrupolar nuclei of half-integer spins, derived by BEHRENS [1, 2] for arbitrary angles of inclination of the spinning axis considering second-order quadrupolar effects, are presented for the practically interesting case of magic angle spinning (MAS) in a form analogous to the expressions for the resting sample. The theory is tested and used for the exact determination of the chemical shift values from the MAS-²⁷Al-NMR spectra of two representative aluminates.     

Über den Einfluß der Coulombwechselwirkung bei der Inneren Feldemission

Zeitschrift für Physik A Hadrons and nuclei - Es wird die Dämpfung der Valenzbandzustände der Kristallelektronen im äußeren elektrischen Feld untersucht. In...     

Relaxation des Natrium-Grundzustandes bei Stößen mit den stabilen Helium- und Wasserstoff-Isotopen

The spin-polarization of the optically pumped Na-groundstate is investigated in presence of the stable He- and H₂-isotopes. The following disorientation cross sections are derived from the pressure dependence of the relaxation rate:σ=(16.2±2.0) · 10^?26 cm² for He³ σ=(2.4±0.5) · 10^?26 cm² for He⁴ σ=(3.9±1.5) · 10^?26 cm² for H₂ σ=(2.3±1.0) · 10^?26 cm² for D₂. These values can be compared with theoretical cross sections based on two relaxation models and indicate the existence of a relaxation mechanism involving the exchange of the electronic alkali-spin with the nuclear spin of the foreign gas.