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The structure of uranium hexafluoride has been redetermined by electron diffraction. Special precautions were taken to eliminate sample contamination; both sector and non-sector photographs were analyzed. Even casual inspection of the photographs and microphotometer traces shows that insofar as this type of measurement is concerned, the structure of UF6 is not a regular octahedron. The model which is in best agreement with the data is a distorted octahedron with three short (1.87A) and three long bonds (2.17A). However, a model with a center of inversion, possessing two short (1.87A), two medium (2.12A), and two long bonds (2.22A) cannot be eliminated. The disagreement between the structures deduced from various technics is discussed, as are also possible experiments which might be done to resolve these differences.
S. H. Bauer (Sun,) studied this question.