Infra-Red and Raman Spectra of Fluorinated Ethylenes. III. Tetrafluoroethylene

The infra-red absorption spectrum of gaseous tetrafluoroethylene between 2 and 22μ has been investigated with a prism spectrometer of high resolution, and the region from 20 to 37μ has been surveyed with a KRS−5 prism. The Raman spectrum of C2F4 gas has been photographed with a three-prism glass spectrograph of linear dispersion 15 A/mm at 4358A, and semiquantitative polarization measurements have been made. All of the 12 fundamental vibration frequencies have been determined, although with some uncertainty for three frequencies obtained from combination bands. The spectra have been interpreted in detail.