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The IR absorption spectrum of KBr crystals doped with BO 3 3- ions in the region 2000-700 cm -1 is reported. The splitting of the v 3 (E') mode indicates that the site symmetry of the ion is lower than C 3v . The observed overtones and combination bands fix the position of v 4 (E') as 584 cm -1 .
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Jaint et al. (1973) studied this question.
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