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Attractive coupling between

As has been noticed by Gelbart and Gelbart [7], the predominant orientational interaction in nematics results from the isotropic dispersion attraction modulated by the anisotropic molecular hard-core. The anisotropy of this effective potential comes from that of the asymmetric molecular shape. The coupling between the isotropic attraction and the anisotropic hard-core repulsion is represented by the effective potential... [Pg.201]

Rotationally mediated trapping is important. The coupling between rotational and kinetic energy arises from the orientational dependence of the attractive portion of the potential. [Pg.53]

Spin correlation analysis [68-71] is an attractive means of representing the coupling between electron spins, having the important advantage of being independent of the spin basis used. We shall consider in the following the particular case of a spin-coupled... [Pg.317]

On comparing the Pseudocyanine spectra of Figures 1, 2, 3, and 5 with those obtained in concentrated aqueous dye solutions (12, 56, 57, 58, 59), obvious similarities of the resulting /-states will be noted. Present and earlier data make it apparent that electronic coupling between adjacent dye molecules can produce similar /-states, regardless of whether appropriate orientation and proximity of the molecules is caused by Coulombic attraction, as in salt formation with polymeric ions, or whether it is induced by van der Waals forces. The latter are primarily involved in the formation of dye aggregates in water as well as in the charge-independent adsorption of dye monolayers at silver halide surfaces (23, 46). [Pg.199]

Laser-based spectroscopic probes promise a wealth of detailed data--concentrations and temperatures of specific individual molecules under high spatial resolution--necessary to understand the chemistry of combustion. Of the probe techniques, the methods of spontaneous and coherent Raman scattering for major species, and laser-induced fluorescence for minor species, form attractive complements. Computational developments now permit realistic and detailed simulation models of combustion systems advances in combustion will result from a combination of these laser probes and computer models. Finally, the close coupling between current research in other areas of physical chemistry and the development of laser diagnostics is illustrated by recent LIF experiments on OH in flames. [Pg.17]

These are the essential phenomenological characteristics of superconductivity. The first significant step in a theoretical interpretation was taken in 1950 when H. Frohlich and J. Bardeen showed that electron-phonon interactions are capable of coupling two electrons together as if there is a direct attractive force between them. [Pg.221]


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Attraction between

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