Title

ESR and Optical Spectroscopy of the AlO Molecule at 4 K; Observation of an Al Complex and Its Interaction with Krypton

Authors

Lon B. Knight

ACS Citation

Knight, L. B. ESR and Optical Spectroscopy of the AlO Molecule at 4 K; Observation of an Al Complex and Its Interaction with Krypton. J. Chem. Phys. 1971, 55, 5066-5066.

Abstract

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 ‖ ( 27 Al ) = 872(1) MHz , and A ⊥ ( 27 Al ) = 713(1) MHz . Δ g⊥ 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 2π i ←X 2Σ transition of AlO. ESRspectra 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.

Source Name

Journal of Chemical Physics

Publication Date

1-1-1971

Volume

55

Issue

10

Page(s)

213-231

Document Type

Citation

Citation Type

Article