Next-neighbor effects

Jacobson A, Leupin W, Liepinsh E, Otting F. Minor groove hydration of DNA in aqueous solution sequence-dependent next neighbor effect of the hydration lifetimes in d(TTAA)2 segments 52. measured by NMR spectroscopy. Nucl. Acids Res. 1996 24 2911-2918. 

Next neighbors effect along the Ca-Sr-Ba- kermanite join long-range vs. short-range structural features. J. Solid State Chem., 202, 134-142. 

We applied the hole digging method to several samples of molecular clusters and quantum spin glasses. The most detailed study has been done on the Fe8 system. We found the predicted square-root t relaxation, Eq. (11), in experiments on fully saturated Fe8 crystals [16, 79] and on nonsaturated samples [34]. Figure 22 analyzes the dipolar distributions, revealing a remarkable structure due to next-nearest-neighbor effects [34]. These results are in good agreement with simulations [80, 55]. 

It is important to know whether adsorbed poisons such as S, C, P. and A extend their negative effects to the first or to the nth. next neighboring atoms orKl their range of interaction on the metal surface (or in the bulk if they are dissolved). The decrease of saturation magnetization of Ni due to atom sorption (by sorption we mean either adsorption or absorption) can help us in speculating on the range of irtteraction. In table 1 are summarized some data available in the literoture concerning some elements in interaction with Ni-based catalysts. 

Still, there is opposite-spin state left at each site. Hopping to one of the next-neighbor sites requires a spin flip. Therefore, metal-insulator transitions involve intersite magnetic exchange coupling. This is the second effect directly or indirectly involved in conductive properties of these crystals. Magnetic effects are briefly discussed in Sect. 4.2. 

It is generally agreed that thermally induced vibrations of atoms in solids play a major role in melting [2.144]. The simple vibrational model of Linde-mann predicts a lattice instability when the root-mean-square amplitude of the thermal vibrations reaches a certain fraction / of the next neighbor distances. However, the Lindemann constant/varies considerably for different substances because lattice anharmonicity and soft modes are not considered, thus limiting the predictive power of such a law. Furthermore, Born proposed the collapse of the crystal lattice to occur when one of the effective elastic shear moduli vanishes [2.138], Experimentally, it is found instead that the shear modulus as a function of dilatation is not reduced to zero at Tm and would vanish at temperatures far above Tm for a wide range of different substances [2.145]... 

Next, the effect of ring currents from phenyl groups on the Si chemical shifts of the main chain Si atoms in PMPS will be discussed. For convenience, a syndiotactic structure with the all-fru 5-zigzag is considered, where phenyl rings are set either perpendicular (type A) or coplanar (type B) to the Si—Si bonds (Fig. 17.5). The effect of ring currents produced by neighboring phenyl... 

It is straightforward to identify via the formula diagram the terms necessary for computing /j, as is the subject of a few end-of-chapter exercises. It is not always so easy to anticipate/ in advance of the message tape. Eor example, C-C constitutes one of seven ABAs in ethane. However, its tape frequency is 0.250 on account of extended collisions and nearest-neighbor effects. If a thermal contact transpires at C-H, there is a one in four chance that the next (i.e., influential) message unit will be C-C. 

Nevertheless, there is still a weak attraction between mercury atoms. At very low densities, in fact (p = 1.89 g cm in Fig. 4.8), the first peak in g R) falls at the equilibrium distance Rng- of the dimercury potential. This distance is much greater than the next neighbor distance in the dense liquid. Thus the effective potential in mercury does actually change with density and even though bonding effects are very weak, the essential d Tiamic units in the vapor are quite different from the screened ions of the dense liquid. In Sec. 4.5.2 we discuss the repulsive part of the potential in connection with its influence on the equation of state. We show there that the repulsive part of the potential near the core is relatively soft. In particular, if we represent the repulsive potential by a power law of the form R) = C(l// )", then in the insulating vapor the exponent n is about 7. This is a consequence of induction effects of the sort mentioned in Sec. 4.2.2. At high densities (p > 12 g cm ) the repulsion is much harder and an exponent n 15 is characteristic. 

From theoretical considerations it has been argued that the effect of is a local effect extending at most to the next neighbor position. 

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