Near-neighbor spectra

Figure 13- CP-MAS spectra of hydrocellulose from cotton linters associated with two near-neighbor spectra obtained after 50s of spin exchange. The format is the same as in Figure 12.

Figure 11. Spectral method for isolating the near-neighbor spectrum of an line in Rhlzoclonlum cellulose. The number of...

Assuming that the pure I j and Ig spectra are given in Figure 1, an Igj or Ig initial perturbation yields a near-neighbor spectrum which is richer, compared with the parent spectrum, in... 

Because so many different chromophores are involved in the c.d. spectrum of a monosaccharide, fundamental interpretation of the spectrum is difficult. On the other hand, similarities among the various difference-spectra having identical conformations in near neighboring groups suggest that a catalog... 

Note added in proof. Earlier in the text it was mentioned that the model used to describe the structure function of low density H20(as) does not describe that of high density H20(as). However, Narten, Venkatesh and Rice 27) do show than an ice I-like network with a near neighbor distance of 2.76 A has the density and distance spectrum of high density H20(as) if one permits 45% of the cavities characteristic of this structure to be occupied by water molecules. These are not ordinary unbonded interstitials. If the cavity molecules are located on the c axis at a distance of 2.76 A from the nearest network molecule each cavity molecule would have second neighbor network molecules at a distance of 3.25 A. Moreover, since occupancy of 45% of the cavities implies that 81% of the water molecules are part of the tetrahedral network and 19% in cavity positions, the average coordination number of nearest neighbors in this model is 4.3, as is found for H20(as) 10 K/10 K. Structure functions calculated for this interstitial variant of a randomized ice I model (the randomization is effected as in the simple ice I... 

With increasing density, N-body interactions with N = 3, 4,. .. may have a discernible effect on the total intensities as well as on the shape of the absorption profile. One may expect a ternary component, and at higher densities perhaps four-body, etc., spectral components that are superimposed with the binary spectrum. At the highest densities (e.g., liquids and pressurized fluids) every monomer may be assumed in permanent interaction with a substantial number of near neighbors. At intermediate densities, that is well below liquid densities, one may be... 

Among the Group IIA salts, indications are that strontium azide 24) has an ionic lattice with the cations surrounded by eight near-neighbor azide ions. Barium azide, however, has a structure of lower symmetry (25) which shows some departures from a purely ionic lattice. This is evident from its non-totally reflecting reststrahlen infrared spectrum 26) and the presence of asymmetrical Ni ions (c/Table 2). 

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