Abstract
The molecular structures of cis- and trans- dibromoethylene, tribromoethylene, vinyl bromide, tetrachloroethylene and trichloroethylene have been determined by the method of electron diffraction in gases. It has been found that the diffraction pictures of these substances can be satisfactorily represented by plane structures having the following interatomic distances: C=C 1.3, C–Br 2.0 and C–Cl 1.8A. The diffraction in carbon tetrachloride has been investigated with several widely differing electron velocities.

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