Frobeniusautomorphismen endlicher Gruppen

Ohne ZusammenfassungHerrnGottfried Köthe zum 60. Geburtstag am 25. 12. 1965 gewidmet     

Use of pulsed D2O laser for far-infrared EPR spectroscopy of DyPO4

EPR has been performed at 4.2°K on Dy³⁺ in DyPO₄ at 58.25 cm^-1, yielding g = 19.55 ± 0.16. The linearity of the Zeeman splitting indicates no perturbation from other levels, and in particular, that there are no levels between 58.25 cm^-1 and 23.0 cm^-1.     

A small gaussian basis set for non-empirical all-electron SCF calculations on iodine compounds

A small gaussian lobe basis is given for MO SCF calculations on iodine compounds within reasonable computing times. The reliability of the calculations is tested by a comparison of the calculated with the experimental X-ray fluorescence spectrum of iodine. The agreement of both, as well as the correspondence of calculated and experimental physical properties of diatomic compounds, indicate the basis to be suitable for a quantum chemical treatment of larger molecules containing this element.     

[14α, 15α-3H] steroids for pharmacological research

It is shown in the present work that the labelling of steroids in ring D is suitable for the production of stable compounds. Two syntheses are described. The final products represent the tritium labelled forms of two pharmacologically important 4,9-dienones with high radiochemical purity. Unfortunately, these dienones are very sensitive to self-radiolysis. They must be stored as diluted solutions at low temperature.     

Elastic scattering of 0.5 MeV gamma rays by heavy elements

The absolute differential cross sections for the elastic scattering of 0.511 MeV gamma rays were measured in the angular range 0.5? to 10? for the elements withZ=72 toZ=92. The experimental method, employing annihilation radiation in coincidence, permits the investigation at very small momentum transfer. In general the results obtained are in very good agreement with the predictionZ ² r ₀ ² for the differential Rayleigh cross section atθ=0? and with the form factor theory, using Hartree-Fock-Slater wave functions, for the investigated angular range. However, for the elements lead, bismuth and thorium we found marked deviations from the form factor predictions, occurring at very small scattering angles. This is attributed to an outer atomic charge distribution different from the other investigated elements, which is also indicated by considerably greater metallic radii. Also effects due to the crystalline structure cannot be excluded. — Further, an elastic, resonance-like andZ-dependent scattering effect by bound electrons is discussed which is due to the formation of an intermediate, bound positronium state by electron-positron pairs.     

CO2-Laserinduzierte Isomerisierung von Methylisocyanid

Ohne Zusammenfassung