Neighbor exclusion principle

Veal et al. suggested that bisintercalation of SDM may violate the neighbor exclusion principle models of this type could be built in the same way as above, starting with the model DNA structure proposed by Rao and Kollman. ... 

Fig. 3 Binding mode of bisintercalators depending on the length of the alkyl chain between the intercalating moieties (A Monointercalation. B Bisintercalation with violation of neighbor-exclusion principle. C Bisintercalation)...

The nuclei of the atoms in a solid and the inner electrons form ion cores with energy levels little different from corresponding levels in free atoms. The characteristics of the valence electrons arc modified greatly, however. The stale functions of these outer electrons greatly overlap those of neighboring atoms. Restrictions of the Pauli Exclusion Principle and the Uncertainty Principle force modification of the state functions, and the development of a set of split energy levels becomes a quasi-continuous band of levels of width, which are several electron volts for most solids. Importantly, unoccupied levels of the atoms are also split into bands. The electronic characteristics of solids are determined by the relative position in energy of the occupied and unoccupied levels as well as by die characteristics of the electrons within a band. 

COVALENT BONDING involves a pair of electrons with opposite electron spin. The bond (or electron charge distribution) is essentially localized between nearest neighbor atoms that contribute electrons for the bonding. Since these electron pairs follow Bose-Einstein statistics, therefore they are known as boson. In this case the paired particles do not obey the Pauli Exclusion Principle and many electron pairs in the system may occupy the same energy level. 

The upper drawing in Fig. 34 is a schematic, electron-domain representation of the spin-density in a plane through two neighboring comer atoms and the adjacent center atom in Slater s model of the alkali metals. Solid circles represent the atoms kernels (M+ cations). The Pauli Exclusion Principle permits domains occupied by electrons of opposite spin to overlap (comer atoms with the central atom), but prohibits overlap between domains occupied by electrons of the same spin (comer atoms with comer atoms). 

In a lattice-gas the individual cells are the structural units of a D-dimensional regular lattice. Each cell is defined by its position vector r on the discrete space, a finite number of states s(r ) and a set of transition rules E that map the state of the cell at time t into the state at time t + 1. A finite number of particles reside in each cell. A discrete velocity c, with / = 1,..., k is associated to each particle. This velocity is chosen such that the particle can propagate to a neighboring cell in unit time. Each velocity direction is subject to an exclusion principle of utmost single occupancy. The combinations of occupancies define the set of possible states associated with each cell. The configuration of each cell is defined by the Boolean field... 

The characteristic properties of the metallic state of matter follow from two overwhelmingly important physical effects the overlap of valence electron wave functions on neighboring atoms and the Pauli exclusion principle. These effects are embodied in the nearly-free-electron (NFE) model of metals. 

Among the first of them are the so-called substitution effects due to steric, induction, catalytic, or some other types of influence of the reacted active centers on the reactivity of neighboring unreacted centers. In order to take account of such short-range effects it has been suggested (Kuchanov, 1978) to use under mathematical modeling an extended Flory principle. In line with this principle, the reactivity of any active center of a molecule is supposed to be controlled exclusively by local chemical structure of the... 

The chemical methods depend almost exclusively on two principles chain scission or neighboring side group reactions. The methods that work on... 

The chemical methods depend almost exclusively on two principles— chain scission or neighboring side-group reactions. The methods that work on the chain scission principle use the fact that one of the two components of a bipolymer (or other copolymers) will be attacked by a specific reaction process, while the chain of the other component is stable. The copolymer of isobutylene with about 2 % isoprene,... 

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