Bøger i Handbuch der Physik Encyclopedia of Physics serien

will be "asymptotically integrable", that is to say, if we displace a vector parallel to itself along a closed curve whose total length is proportional to r, then, as we remove the curve to infinity, the change of the vector that results from the circuit about the curve will tend to zero.

In the case of low impedance (high current and low voltage) few turns of thick metal should be used. In the case of high impedance (low current and high voltage) many turns of thin material are needed. A nice system for low impedance coils was deve loped by BITTER.

With this as goal, the writers were asked to present their specific field in such a way that access is possible to any scientist without special a priori information in that field;

Parallel to the development of new experimental methods, an impor tant step beyond the independent-particle model was made on the theoretical side through the development of various approaches to treat electron cor relation effects seen in photoionization and electron spectroscopy.

The main task is to arrive at a physically correct treatment of electronic degrees of freedom, as for example in an electronic 'shell' model, which leads to the description of phonon spectra in terms of long-range polarizabilities and short-range deformabilities.

159 elements only between states which differ in one of the single-electron wave functions, in short, HeR induces only one-electron transitions. The matrix elements 1mn and Pmn reduce to matrix elements between the single-electron wave functions.

Although all the relations for a plane interface can be deduced from the cor responding ones for a spherical interface by putting the curvature equal to zero, the planar and the spherical cases are considered separately because of the prac tical importance and easy physical visualization of a plane interface.