The fine structure of the parallel-type band due to the C–H stretching vibration of ethylene has been obtained with a 7500-line grating. From the measured wave numbers of the lines of this band the mean of the two large moments of inertia of C2H4 has been determined as 30.08×10—40 g cm2. This value combined with the value C=5.70×10—40 g cm2 for the small moment gives for the large moments of inertia A=33.20×10—40 g cm2 and B=27.50×10—40 g cm2. These values are in good agreement with those previously reported.
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L. G. Smith (1940) studied this question.
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