Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
The Motion of Ethylene Halide Molecules in Crystals as Revealed by the Raman Effect.
San-ichiro MizushimaYonezo Morino
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1938 Volume 13 Issue 1 Pages 182-189


In the region of the unmodified line there have been observed for crystalline ethylene halides some Raman lines which correspond to motions of a molecule as a whole, but not to internal normal vibrations. For ethylene bromide a considerable change in these low frequency lines was observed between the spectrum at −40°C. and that at 0°C. and it is highly probable that this change is caused at the transition temperature (−24°C.) observed in the thermal measurement. An explanation for these experimental results was suggested to identify these lines with lattice frequencies and to regard the transition point as the temperature at which the one dimensional molecular rotation sets in.

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