THE RAMAN SPECTRUM OF ETHANE

Abstract

The rotational and rotation-vibrational Raman spectra of gaseous ethane at 1–3 atm. pressure have been photographed with a spectral resolution of approximately 1 cm.−1. Analyses of the rotational structures of the ν1 and ν2 totally symmetric bands were carried out; only the Q branch of the ν2 band was observed. The structures of the degenerate ν10 and ν11 bands were analyzed; however, no trace of ν12 was found. The structure of the ν10 band shows beyond doubt that the point group of the molecule is D3d. From the ν11+ν4 infrared band, and the ν11 Raman band, the value, 278.4 cm.−1, is deduced for the torsional frequency ν4.