ESR and Optical Spectroscopy of the AlO Molecule at 4 K; Observation of an Al Complex and Its Interaction with Krypton
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.
Version of Record
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 2Σâ†X 2Σ absorption bands near 4500 Ã…, a progression of weak bands have been observed between 5500 and 11 000 cm−1 and assigned to the A 2Ï€ i â†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