Abstract
The infrared absorption spectrum of Al2O trapped in solid argon and krypton matrices has been observed. It is possible from the observed spectra and isotope shifts for Al216O and Al218O to conclude that the molecular symmetry of Al2O is C2v and that the Al–O–Al angle is probably not far from 145°. Force constants and the bending frequency v2 have been calculated. Reanalysis of the ultraviolet spectra of exploding aluminum wires provides additional support both for the bent structure and for the calculated value of v2. The Al–O bond distance is estimated to be 1.66 Å. The three fundamental frequencies for Al216O in an argon matrix are (in cm—1): v1 = 715, v2 = [238]; v3 = 994.
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