Abstract
The accurate harmonic vibration frequencies together with the infrared (IR) and Raman intensities of the most stable conformers of Al2O2 and Al2O3 molecules have been calculated by the density functional theory (DFT) method with B3LYP exchange–correlation potential and using a set of the augmented correlated consistent basis sets up to quintuple order. The anharmonic vibration frequencies of the non-linear Al2O2 molecule have also been calculated. The obtained equilibrium geometrical parameters, harmonic and anharmonic vibration frequencies along with the IR and Raman intensities good converge to their limits with increasing the size of the used basis set. A comparison of the calculated harmonic and anharmonic vibrational frequencies with the available experimental ones points out that the small differences between the calculated harmonic and experimental frequencies can be further substantially reduced when calculations of the anharmonic vibrational frequencies will be available for all types of molecular geometries.
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Mitin, A.V. Accurate theoretical IR and Raman spectrum of Al2O2 and Al2O3 molecules. Struct Chem 22, 411–418 (2011). https://doi.org/10.1007/s11224-011-9736-9
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DOI: https://doi.org/10.1007/s11224-011-9736-9