Titlebook: Solid Hydrogen; Theory of the Proper Jan Kranendonk Book 1983 Springer Science+Business Media New York 1983 Vibration.crystal.diffusion.ene

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Clusters of , = 1 Impurities in , = 0 Solids,ations is finite for . ≲ 20%, as discussed in section 3.4. At sufficiently low concentrations ., it is therefore appropriate to analyze the properties of these solids in terms of . containing small numbers of . = 1 molecules, such as singles, nn pairs, triples with at least two nn separations, etc..

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The Ordered Phases,g of crystals with concentrations . of the . = 1 species close to 100%. In such crystals a . occurs at a transition temperature .. which, in zero-pressure H. and D. at . = 1, is equal to about 3.0 and 4.0 K, respectively, and which decreases with decreasing .. In the . the rotational angular momenta

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Rotation Diffusion and Ortho-Para Conversion,xample, this diffusion is responsible for the electrical conductivity of these crystals at high temperatures. In solid H. and D. the diffusion of . = 1 impurities just below the melting temperature has been observed through its effect on the NMR spectra.. This molecular motion decreases exponentiall

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