The phase transition in superconductors - I. Nucleation

Abstract
A new treatment of the structure of both planar and twisted forms of ethylene is given. Attention is focused on the unsaturation electrons, to which the method of atoms in molecules is applied. Values are calculated for the location of the N $\rightarrow $ V absorption bands, which are in good agreement with the observed spectrum. The twisting frequency is also estimated. The results obtained are uniformly better than those of previous calculations.

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