Polarographische Untersuchungen in wasserfreiem Äthylendiamin

Zusammenfassung Es wird die Darstellung von wasserfreiem Äthylendiamin mit bisher noch nicht erreichter Reinheit beschrieben sowie über die Einbeziehung der Derivativpolarographie in die Untersuchungs methodik berichtet. Damit werden die in früheren Arbeiten^1,2 erhaltenen Ergebnisse überprüft, der Einfluß der Temperatur untersucht sowie eine Relation zwischen wäßriger Normal. kalomelelektrode und nicht wäßriger Gegenelektrode gegeben.Mit 12 Abbildungen     

Elastische Elektronenstreuung am40Ar zur Bestimmung des quadratisch gemittelten Kernradius

The elastic electron scattering cross section of⁴⁰Ar has been measured relative to that of the proton using gas targets. The momentum transfer ranged between 0.28 and 0.50 fm^?1 (40–60 MeV, 90–120 °). From partial wave calculations, anrms charge radius of (3.41±0.04) fm was evaluated. The error includes uncertainties due to the choice of the charge distribution.     

The Sachs moment and finite size effects in muonic hyperfine structure

In calculations of finite size effect in muonic hyperfine structure, the meson exchange part of nuclear magnetism has so far not been taken explicitly into account. We investigate this effect for the Sachs moment and show that the reduction factor is approximately the same as for the orbital part. Consequences for theoretical values of the h.f.s. constant A₁ are discussed for the special nucleus ²⁰⁹Bi.     

Self-consistent electronic structure and ground state properties of TlCl

We present the first self-consistent, relativistic, ab initio calculation of the electronic structure, equilibrium lattice constant, cohesive energy and compressibility of TlCl, as an example of a semiconductor with high atomic number and high ionicity. The theoretical approach is based on the local density-formalism. Our results explain the salient features of recent photoemission measurements and describe the ground-state properties with good accuracy.     

Der Zerfall des Cu61

Theγ-ray-spectrum of Ni⁶¹ associated with the E.C. andΒ ⁺-decay of Cu⁶¹ has been measured with a Ge(Li)-counter. The observed 14 newγ-ray-transitions led to a new level-scheme for this decay with Ni⁶¹-Ievels at: 67.7, 282.9, 656.0, 907.9, 1099.8, 1132.7, 1186.8, 1610.6, 1730.8 and 2128.0 keV. Five of these levels were known from earlier investigations of Cu⁶¹-decay, but all of them could be identified with some of previously reported levels found in scattering experiments. As far as possible spin and parity assignments have been made and are compared with the results of scattering experiments.     

The dynamics of triplet exciton trapping in 1,2,4,5- tetrachlorobenzene

The phosphorescence intensifies and decay times of the triplet exciton and X₂-trap emission in neat and doped 1,2,4,5-tetrachlorobenzene crystals were measured as a function of temperature. The comparison of the results found on neat and doped crystals allows the statement, that exciton trapping is not limited by the motion of the excitons towards the traps but by the trapping step on the trap molecule solely. For the individual trapping step a rate of about 3 × 10⁶ S^?1 was determined.     

Complex formation and kinematic coupling: complexed ethylene

The hypothetical system of an ethylene-thallium(III)-water complex, C₂H₄-Tl³⁺-H₂O, was used to demonstrate in principle the possibility of kinematic couplings between internal ligand and complex framework vibrations in an organometallic complex.