dc.creator Bauman, Robert P. en_US dc.date.accessioned 2006-06-15T12:42:17Z dc.date.available 2006-06-15T12:42:17Z dc.date.issued 1954 en_US dc.identifier 1954-H-5 en_US dc.identifier.uri http://hdl.handle.net/1811/7267 dc.description $^{1}$E. Teller and B. Topley, J. Chem. Soc. 1935, 885 $^{2}$ J. B. Howard, J. Chem. Phys. 5:442 (1937) en_US dc.description Author Institution: Mellon Institute en_US dc.description.abstract Examination of the infrared and Raman spectra of dimethyl acetylene and perfluorodimethyl acetylene (hexafluoro-2-butyne) suggested a re-examination of the selection rule arguments for freely rotating ethane-type molecules. Teller and $Topley^{1}$ originally assumed $D_{3}$ selection rules for freely rotating ethane. $Howard^{2}$ later showed that the degenerate species is split by the higher symmetry of the potential field. Because he used a plane of symmetry ($\sigma_{h}$) as the additional symmetry element, he called the new selection rules $D_{3{h}}$. Howard had also pointed out, however, that a center of symmetry (i) could have been used as the additional element. This would lead to $D_{3{d}}$ selection rules rather than $D_{3{h}}$. Although these groups were equivalent for Howard’s work, they produce significant differences in the Raman spectrum and in infrared combination tones. The selection rules followed by a freely rotating ethane-type molecule are shown to be those of the point group $D_{3{d}}$. en_US dc.format.extent 100506 bytes dc.format.mimetype image/jpeg dc.language.iso en en_US dc.publisher Ohio State University en_US dc.title SELECTION RULES FOR FREELY ROTATING ETHANE-TYPE MOLECULES en_US dc.type article en_US
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