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The far-infrared spectra (350–35 cm−1) of gaseous ethyl methyl ether-d0 and ethyl methyl-d3-ether have been recorded at a resolution of 0.10 cm−1. For the d0 species, the fundamental asymmetric torsion of the more stable trans conformer (two methyl moieties are trans to one another) has been observed at 115.40 cm−1 with four upper state transitions falling to lower frequency, whereas, for the gauche...
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