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Measurements of the distribution of rotational states in a nitrogen molecular beam before and after deflection by collision with rare gas atoms are interpreted in terms of the intermolecular potential. A potential of the form V(R, θ) = 4?(1 + b2P2(cosθ)| R*12 ? 4θ [1 + α2P2(cosθ)]/R*6 is used with semiclassical theory using the sudden approximation to fit the observations. As α2 is known, as well as ? and the size parameter, σ, the objective is to find b2. However, the calculated state distributions are found to systematically vary from those measured, irrespective of the value of b2. This result is tentatively explained as due to the inadequacies of the 12-6 potential.  相似文献   
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Chemical modification of polymers leads to changes in triboelectric charging properties which are proportional to the degree of conversion. This contrasts to physical mixtures in which the surface energy causes one component to dominate the surface, hence the charging properties. Relationships between molecular structure and triboelectric charging have been deduced from the results. Thus the direction of change of triboelectric charging on chemical modification is governed by the nature of the reaction and the magnitude of the change is governed by the extent of reaction.  相似文献   
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