Potential quasi-rest

Where b is Planck s constant and m and are the effective masses of the electron and hole which may be larger or smaller than the rest mass of the electron. The effective mass reflects the strength of the interaction between the electron or hole and the periodic lattice and potentials within the crystal stmcture. In an ideal covalent semiconductor, electrons in the conduction band and holes in the valence band may be considered as quasi-free particles. The carriers have high drift mobilities in the range of 10 to 10 cm /(V-s) at room temperature. As shown in Table 4, this is the case for both metallic oxides and covalent semiconductors at room temperature. 

In this method, the respective positions of about 100 ions (inner zone) are calculated under various assumptions for the inter-ionic potentials, assuming the rest of the lattice as a quasi-continuum. A polarization per unit cell is attributed from measured values of the static dielectric constant. The configuration within the iimer zone (which may generate a cluster ) is varied until the total energy of the lattice is minimized ... 

In this table, it is seen that the levels appear clustered into quartets aa to be expected from a four well potential energy surface. The first quartet corresponds to the fundamental level. The first and second excited quartets may be attributed to the wagging mode, whereas the third one to the bending mode. This assignment rests on the theoretical intensities given in Table 4. No strong intensities were obtained between the first and third levels, nor between the second and the fourth ones. In addition, the two wagging transitions present a quasi harmonic behavior. 

Computer simulations are methods addressed to perform computer experimentation . The importance of computer simulations rests on the fact that they provide quasi-experimental data on well-defined models. As there is no uncertainty about the form of the interaction potential, theoretical results can be tested in a way that is usually impossible with results obtained by experiments on real liquids. In addition, it is possible to get information on quantities of no direct access to experimental measures. 

The potential of numerical weather prediction technique to study the chmate of the atmosphere was recognized in early days of numerical weather prediction when Norman A. PhiUips succeeded in 1956 an extended time integration of a two-level quasi-geostrophic model, starting fiom an atmosphere at rest. He demonstrated that marty features of the general circulation of the atmosphere could be simulated by the model. Since then mar general circulation models (GCMs) have been started to develop based on the primitive-eqrration model formrrlation (Sec-... 

Since in Ag2+jS we are dealing with electrons of high mobility, we start out with the band model and consider the electrons to be quasi-free particles in the field of the periodically ordered ions. The influence of the periodic potential upon the mobility of an electron is then taken into account by introducing the so-called effective mass m, which is different from the rest mass of the electron. Let p be the momentum of an electron, where p vanishes at the lower edge of the band with potential energy 0. Then the number Z of cells in that sector of phase space with momentum between p and p 4 dp calculated per unit volume for the case of an isotropic material is given by ... 

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