Stress-induced optical dichroism of V−-centers in MgO |
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Authors: | FA Modine |
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Institution: | Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, U.S.A. |
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Abstract: | The stress-induced optical dichroism and optical absorption spectra of the V?-centers in electron irradiated MgO are reported. The dichroism spectrum can be largely attributed to a paraelastic alignment of inherently-dichroic V?-centers. A curve-fit analysis of the lower-energy portions of the dichroism and absorption spectra yields the ratio of the transition dipole strengths, , and the energy splitting, E∥ ? E⊥ = 0.22 ± 0.07 eV, for light polarized parallel (∥) and perpendicular (⊥) to the defect symmetry axis. The spectra also have considerable intensity in their high-energy tails, and it is speculated that a portion of this intensity is due to the V-center. The implications of the results with regard to the electronic structure of the center are discussed. |
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