Vol. 19, No. 7 (1963)
1963-04-05
CONTENT
1963, 19 (7): 409-424.
doi: 10.7498/aps.19.409
Abstract +
By means of the LT representation the author calculated the energy levels and the splittings of sharp lines in ruby. The interaction between various configurations has been taken into account. The splittings of energy levels of R and B lines so obtained agree well with experimental results. But the splitting of ground state comes out too small to be compared with experiment. If may be attributed to the perturbation of the higher energy levels. .
1963, 19 (7): 425-441.
doi: 10.7498/aps.19.425
Abstract +
The advances of solid state negative-resistance devices, such as tunnel diodes, variable reactance semiconductor diodes used in parametric forms, lead to the interests of the study of periodically loaded travelling type distributed amplifiers. This paper gives a detailed analysis on the transmission characteristics of this type of microwave amplifier. The analysis includes the study of the phase equation, gain equation, the frequency-phase characteristics, the pass band vs stop band relationships and the phase velocity and group velocity characteristics. A detailed analysis on the travelling wave type semiconductor diode parametric amplifier is also given. Important universal curves and design conditions are also included for ready references.
THE DIFFUSION LENGTH OF MINORITY CARRIERS IN N-TYPE SILICON MEASURED WITH A SURFACE BARRIER DETECTOR
1963, 19 (7): 448-455.
doi: 10.7498/aps.19.448
Abstract +
The non-equilibrium minority carriers produced by the α-particles while penetrating into the diffused layer of the Au-Si surface barrier detector diffuse into the boundary of barrier layer and are then collected. Hence an output pulse is obtained at the two terminals of the detector. The collecting efficiency in the diffused layer and the relations between the collecting efficiency and the diffusion length are calculated. The experimental results have been compared with the theory, and the diffusion length of minorty carriers is then determined.
1963, 19 (7): 456-465.
doi: 10.7498/aps.19.456
Abstract +
Using the method of van Hove in the theory of approach to equilibrium, we analyse Kubo's formula of transport coefficients. The results of dynamical theory are obtained without using the assumption of random phase and compared with the solution of Boltzmann equation. We expect that the phase interference effect may be observed in the high-frequency phenomena of strongly interacting system. The macroscopic measurement of high-frequency linear transport process does not destroy this interference effect.
1963, 19 (7): 466-471.
doi: 10.7498/aps.19.466
Abstract +
A mineral having the chemical formula of BaCe(CO3)2F newly found in China is called Hwanghoite and may be named from the structural point of view as barium-synchysite.It is shown by X-ray examination that the crystal structure of this mineral has the pseudo rhombohedral unit cell with α=5.1?, c=19.6? and space group C34- R3. The unit cell contains three molecules of BaCe(CO3)2F. The positions of the heavy-atoms are located by the symmetry of the space group and verified by the single crystal X-ray diffraction intensities, while that of the light-atoms are deduced from geometrical and chemical considerations on the basis of the heavy-atom positions.The reliability of the pseudo structure so obtained is discussed and the important aspects of the structure are compared with similar known minerals.
