ESR OF THE BO AND AlO MOLECULES: EVIDENCE FOR A AlO Kr MOLECULE AT $4^\circ K$

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1970

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Ohio State University

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BO and AlO molecules have been trapped in rare-gas matrices at $4^\circ K$ in their $^{2}\Sigma$ ground states. Hyperfine (hf) interactions, g tensor, and matrix effects are strikingly different for these two species. BO exhibits a large unpaired spin density at the boron nucleus, is highly oriented in a ncon matrix, and has g values near $g_{e} = 2.0023$ in all matrices. In the ionic AlO molecule, only 20% of the odd electron is on the aluminum atom, and $k_{1}$ and $A_{1}$ (hf splitting of $^{27}Al$) are extremely sensitive to the rare-gas $employed.^{1}$ $^{83}Kr$ hf structure has been resolved in that matrix associated with an extra set of lines that vanish above $35^\circ K$ and reappear upon cooling to $4^\circ K$. The molecule formed between AlO and one Kr atom is presumably linear and exhibits a high degree of preferential orientation in the matrix. Its Al hfs is greater than that of AlO in a non-complexed lattice site.

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$^{1}$L. B. Knight, JR., W. C. Easley, and W. Weltner, JR., J. Chem. Phys. 52 1607 (1970).""
Author Institution: Department of Chemistry, University of Florida

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