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Charge-Transfer Spectra of Transition-Metal Ions in Corundum

Charge-Transfer Spectra of Transition-Metal Ions in Corundum The ultraviolet absorption spectrum of corundum ( Al 2 O 3 ) containing dilute concentrations of the 3 d -series transition-metal ions Ti 3 + , V 3 + , Cr 3 + , Mn 4 + , Fe 3 + , and Ni 3 + was measured at room temperature and at liquid-nitrogen temperature for photon energies in the range 3-9 eV. The most important features of the observed spectra are (a) the peak positions are characteristic of the particular impurity ion; (b) the peak positions and widths (∼0.7 eV) are independent of temperature over the range studied; and (c) the integrated intensities are strong. The spectra are identified with the allowed transition whereby an electron is transferred from a nonbonding orbital, localized predominantly on the O = ligands, to either the t 2 g ( π * ) or e g ( σ * ) antibonding orbital, localized predominantly on the metal ion. The position in energy of the first absorption peak for the various ions of the series relative to one another and to the position of the intrinsic absorption edge of Al 2 O 3 is in good agreement with the charge-transfer model. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Charge-Transfer Spectra of Transition-Metal Ions in Corundum

Physical Review B , Volume 1 (1) – Jan 1, 1970
10 pages

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Publisher
American Physical Society (APS)
Copyright
Copyright © 1970 The American Physical Society
ISSN
1095-3795
DOI
10.1103/PhysRevB.1.126
Publisher site
See Article on Publisher Site

Abstract

The ultraviolet absorption spectrum of corundum ( Al 2 O 3 ) containing dilute concentrations of the 3 d -series transition-metal ions Ti 3 + , V 3 + , Cr 3 + , Mn 4 + , Fe 3 + , and Ni 3 + was measured at room temperature and at liquid-nitrogen temperature for photon energies in the range 3-9 eV. The most important features of the observed spectra are (a) the peak positions are characteristic of the particular impurity ion; (b) the peak positions and widths (∼0.7 eV) are independent of temperature over the range studied; and (c) the integrated intensities are strong. The spectra are identified with the allowed transition whereby an electron is transferred from a nonbonding orbital, localized predominantly on the O = ligands, to either the t 2 g ( π * ) or e g ( σ * ) antibonding orbital, localized predominantly on the metal ion. The position in energy of the first absorption peak for the various ions of the series relative to one another and to the position of the intrinsic absorption edge of Al 2 O 3 is in good agreement with the charge-transfer model.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Jan 1, 1970

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