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The emission spectra of Eu3+ ions in MgAl2O4 (for excitation at 394 nm) contain both 589nm and 611 nm peaks. The first peak corresponds to the magnetic dipole transition, while the second peak, which corresponds to the induced electric dipole transition, can be observed when there is a deviation from inversion symmetry. The
presence of both peaks indicates that Eu3+ ions probably occupy octahedral Al3+ sites. If Eu3+ ions occupied tetra- hedral Mg2+ sites without inversion symmetry, the intensity of the 589 nm peak would have been dominant.
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2Â¥: Originally posted by bible2 at 2013-09-09 08:28:50
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