Der Zusammenhang zwischen dem magnetooptischen Kerr- und Faraday-Effekt und die optischen Konstanten von dicken Aufdampfschichten aus Eisen,Kobalt und Nickel

The magnetical rotation of the plane of polarisation and the ellipticity of the reflected and transmitted light through magnetically saturated, evaporated layers of iron, cobalt and nickel (30 to 100 mμ) are dependent one another according to the phenomenological theory of W.Voigt. The four measured magnetooptical angles are however independent each other. By comparison of other physical properties, except the magnetooptical ones, (f. e. magnetical saturation, optical absorption) measured respectively with transmitted and with reflected light, we try to prove, that the layers are homogenous at least near the glass-side. The linear increase of Faraday-rotation and optical absorption with the thickness of the layer supports this assumption. Then the independence can only be explaned by a magnetooptical term in the second equation of Maxwell also (precession of spin). The knowledge of the optical constants ist necessary for the comparison of magnetooptical ones. They are find out by measurements of intensity only, using the transmitted light and the reflected light at both sides of the layer. By supernumerarykinds of determination the foult is estimated. The method of Drude is adapted to measurements of intensity and then applied on the glasside too. The results on this side agree with those of transmitted light, the air-side differs a little.     

Quasimolecular nuclear optical potentials

A theory is presented to calculate potentials for the elastic nuclear heavy-ion scattering in a phenomenological way. The density properties of finite nuclei are derived with a schematic ansatz for the interaction energy between nuclear matter. The same interaction energy is applied to the calculation of the real part of the heavy-ion potential, which is of the quasimolecular type. The imaginary part is connected with the outflow time of nuclear matter out of compressed regions of overlapping nuclei. The resulting cross section for the elastic O¹⁶-O¹⁶ scattering reproduces the experiment up to 30 MeV quite well. An effective compression modulus of the S³² compound system can be deduced from the scattering experiment. It results to be about 200 MeV.     

One-photon-exchange processes and inelastic form factors

The general form of cross section for one-photon-exchange processes is given. For unpolarized target and projectile the total cross section is determined by two characteristic functions or form factors, for each, target and projectile. For a projectile without strong, but with electromagnetic interaction one can measure the differential cross section and thereby determine both form factors for any target in the region of kinematical variables available by such scattering experiments. These kinematical regions are investigated. One can insert these measured form factors in cross section calculations for other one-photon-exchange processes. As an example we show that for 2 GeV-W-Meson production by neutrinos on a target the kinematical region of form factors which enter the cross section calculation is covered by electron scattering up to 6 GeV. The impulse approximation is used to estimate form factors for electronnucleus scattering in a special kinematical region.     

Untersuchungen zur Supraleitung des Legierungssystems Zr-Rh

The transition temperatures of Zr-Rh alloys with small amounts of Rh are essentially higher than the transition temperature of pure Zr. Rhodium is not dissolved in the Zr lattice. In the unannealed specimens Rh stabilizes the body centered cubic phase which has aT _c of 6.4°K. After annealing an intermetallic compound is formed with aT _c of about 12°K. This compound is also formed in the unannealed specimens at higher Rh content.     

Übertragung des Kreisproblems auf reell-quadratische Zahlkörper

Ohne ZusammenfassungDiese Arbeit wurde von der Mathematisch-Naturwissenschaftlichen Fakultät der Georg-August-Universität zu Göttingen als Dissertation angenommen. Herrn Prof. Dr.C. L. Siegel, der die Arbeit anregte, bin ich zu großem Dank verpflichtet. Auch Herrn Prof. Dr.H.-E. Richert danke ich für Ratschläge und Hinweise.     

Ein neues universelles entwicklungsreagenz für die papierchromatographie von kationen

In an investigation of 283 organic reagents, tetrahydroxyquinone was found to be a suitable colour reagent in the paper chromatography of inorganic ions from the points of view of universality and sensitivity; all the cations (26) investigated could be located in daylight. Individual cations usually give characteristic colours so that by comparison of colours and R_F-values, absolute identification is possible.     

Notwendige und hinreichende Bedingungen dafÜr,daß eine Raumkurve geschlossen ist

Ohne Zusammenfassung