Gas-phase Raman spectroscopy of the trihalides of aluminium, gallium, and indium. The Raman spectra of solid and liquid indium trichloride and tribromide

Abstract

The gas-phase vibrational spectra of the trihalides of aluminium, gallium, and indium are studied at temperatures up to 900°. The observed vibrational frequencies are assigned appropriately to monomer and/or dimer. ν₁ and ν₄ of all the MX₃(monomer) species (M = Al, Ga, and In; X = Cl, Br, and I) are given for the first time. Tentative assignments of ν₃ are made for AlBr₃, InBr₃, and Gal₃. The vibrational spectrum of solid and liquid InCl₃ and InBr₃ are recorded and discussed.