Some Absorption Bands in the Far Infrared

The following bands have been located in the far infrared spectra by the method of residual rays: cis-dichloroethylene at 170 cm−1; trans-dichloroethylene at 265 cm−1 and 192 cm−1; phosphorus trichloride at 190 cm−1; trans and ``gauche'' 1,2 dichloroethane at 223 cm−1 and 125 cm−1; propylene at 177 cm−1; acetaldehyde at 245 cm−1 and 120 cm−1; methyl alcohol at 190 cm−1, 161 cm−1, and 120 cm−1; carbon suboxide at 192 cm−1.