Die dreidimensionale Stabilisierung von Ladungsträgern in einem Vierpolfeld

It is shown that particles of a specific chargee/m are confined in three dimensions by a high frequency electric quadrupole field with the potential?=c · U(t)· (x ²+y ²?2z ²). The confinement is mass selective. The theoretical predictions are verified by experiments with ions of different masses and with electrons. The mass selection, maximum number of stored charges and their mean life time in the field are measured. Furthermore the influence of a magnetic field on the motion of the charges is investigated.     

Elektrische Leitungsphänomene in anisotropen Medien. III

In lattices, in which the Fermi surface is simply closed, the saturation values of the electrical resistivities in longitudinal/transversal magnetic fields are equal to the approximate values for the resistivities, obtained from the variational method of Kohler using rotation symetrical trial functions/constant relaxion times. — Depending upon the magnetic field direction the changes of the longitudinal and transversal resistance and of the Hall coefficient are proportional to the anisotropies ink-space perpendicular to the magnetic field direction. Depending upon the current direction the change of the transversal resistance is larger in the direction perpendicular to the smaller anisotropy. — By generalization of the results of part II of this paper (concerning special elliptic models) one can conclude, that the saturation of the transversal resistance vanishes in the direction of the axis in presence of cylindrical dispersion surfaces and perpendicular to the open orbits in presense of open oblate Fermi surfaces.     

Elektrische Leitungsphänomene in anisotropen Medien. IV

Another model for the interaction between electrons and phonons, depending explicitely upon the wave vectorsk andk′, is discussed with respect to its influence on galvanomagnetic effects. From the models handled in II it differs mainly in the temperatur coefficients.     

Phänomenologische Betrachtung zur Photon-Elektron-Wechselwirkung in einem Plasma

The question at stake is, whether a simple physical connection may be found between Richardson equation for thermionic emission on the one hand, and Richardson equation for photoelectric emission on the other hand. The proposition of such a connection is based on the following supposition: that electrons are not only elements of a (Fermi-Dirac-) statistical ensemble and, as such, cause thermionic phenomena; but that they can also interact with a radiation field, thereby causing an additional emission current, according to Richardson (photoelectric) equation. — It is shown in detail that the current emitted from a metal of 2000 °K is determined by the complete radiation of this metal only to a very slight degree. It is then estimated however, that within temperatures of some million degrees Kelvin the excitation of electrons caused by complete radiation will be much greater than that caused by interaction.