Spectra and structure of gallium compounds: V—Infrared and Raman spectra of gaseous, liquid and solid trimethylgallium

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Abstract
The Raman spectra (50–3500 cm−1) have been recorded for gaseous, liquid and solid trimethylgallium. The infrared spectra (40–4000 cm−1) have also been recorded for trimethylgallium in the vapor and crystalline states. A complete vibrational assignment is proposed and the out‐of‐plane, GaC3 deformation is assigned to an infrared band observed at 150 cm−1 in the spectrum of the vapor. The vibrational spectrum of the solid is very simple which indicates that the molecule remains monomeric. Only one lattice mode was observed in the far infrared spectrum and none in the Raman spectrum. The spectrum of the solid can best be interpreted on the basis of C3 site symmetry with either one or two molecules per unit cell. Normal coordinate calculations for the skeletal modes have been carried out utilizing a four atom approximation.