Abstract
The infrared spectra of gaseous Al2Cl7 and AlCl3 have been studied from 1200 to 325 cm—1. Bands of Al2Cl6 have been observed at 625, 484, 420 cm—1. One band of AlCl3 at 610 cm—1 has been observed. A calculation of the force constants of these molecules is made. The methods used to obtain the spectra appear suitable for the study of substances which are volatile at high temperatures.

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