Spectroscopy of Eu 3+ ions in Cd 1−3x Eu 2x □ x MoO 4 , points out the three main non-equivalent symmetry sites very close to each other, due to the subtle differences in emission. Eu 3+ ions in this almost ideal red light phosphor possess S 4 point symmetry.
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Guzik et al. (2015) studied this question.
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