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The fine structure of several infra-red absorption bands of C2H4 and C2D4 have been resolved. From the rotational constants so found, the C–C and C–H distances in this molecule were calculated to be 1.353 and 1.071A, and the H–C–H angle to be 119°55′. An assignment of fundamental frequencies has been made which is consistent with the observed data.
Gallaway et al. (Sun,) studied this question.