Physics
Scientific paper
Jul 1958
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1958rspsa.246..119w&link_type=abstract
Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 246, Issue 1244, pp. 119-132
Physics
2
Scientific paper
An apparatus for the photographic determination of the relative intensities of Raman lines of gases and vapours at about 1 atm pressure is described. Results are given for the totally symmetric vibrations of the tetramethyls of carbon, silicon, germanium, tin and lead in the vapour state. Frequency-corrected relative intensities excited by the blue and violet mercury lines show satisfactory agreement. The intensity of the mode consisting principally of symmetrical methyl deformation is too low to be observed for C(CH3)4, but increases (relative to the intensity of the C\chembond{1,0} H stretching mode) as the central carbon atom is progressively replaced by Si, Ge, Sn and Pb. Calculations show that this is accounted for by increased contributions from bond-stretching polarizability changes. Thus Wolkenstein's assumption that the polarizability of a bond is not affected by changes of orientation remains a good approximation.
Waters David N.
Woodward Leroy A.
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