The AlO molecule in its 2Σ ground state has been trapped in neon, argon, and krypton matrices at 4°K, and its ESR and optical spectra (infrared, visible, and uv) measured. In neon its magnetic parameters are g‖ = 2.0015(3), g ⊥ = 2.0004(3), A‖( 27Al) = 872(1) MHz, and A ⊥ ( 27Al) = 713(1) MHz. Δg⊥ is in accord with the magnitude and sign of the spin-doubling constant, γ0, determined in the gas phase. An infrared band at 924 cm−1 in neon (917 cm−1 in argon) is assigned to AlO: the large shift from the gas value of 965 cm−1 indicates a highly ionic molecule. Besides the strong B 2Σ←X 2Σ absorption bands near 4500 Å, a progression of weak bands have been observed between 5500 and 11 000 cm−1 and assigned to the A 2πi←X 2Σ transition of AlO. ESR spectra of a weakly bonded Al–X molecule (where X may be Al2O) are observed in concentrated matrices; its magnetic properties are found to be very dependent upon the matrix gas used. In krypton matrices, 83Kr hfs is also observed but disappears (reversibly) above about 35°K, suggesting the formation of a metastable Kr–AlX complex.
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Knight et al. (1971) studied this question.
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