The Raman Spectrum of Tetraethyl Silane. Vibrational Resonance of Tetraalkyls

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Abstract
The Raman spectrum of tetraethyl silane is reported. Assignments of frequencies for this compound and for other tetraalkyls are made. An analysis of resonance between vibrations v1+v2 and v3 explains the presence of extra lines which appear in the Raman spectra of each of these compounds. Resonance between frequencies 2v2 and v4 explains the presence of two additional lines observed in Si(C2H5)4. Resonance between ethyl vibrations in Si(C2H5)4 and in Pb(C2H5)4 accounts for a split in the frequencies characteristic of the ethyl group. First‐order perturbation calculations of the observed resonance effects are given in some detail.