Electronic and vibrational spectra of MnO2?4 in KBr crystals |
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Authors: | Risal Singh SK Agarwal |
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Institution: | Solid State Physics Laboratory, Lucknow Road, Delhi-110007, India |
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Abstract: | Two new features have been observed in the electronic spectrum of KBr crystals doped heavily with MnO2?4 ions. The band at 870 nm is assigned to the crystal field transition e → t2. The band at 600 nm shows a series of vibrational sub-bands at an interval of 740cm?1 and is ascribed to the coupling between electronic transition and totally symmetric mode of the ion.A line at 830cm?1, ascribed to totally symmetric mode v1(A1), has been observed for the first time in the Raman spectrum. I.R. spectrum of KBr: MnO2?4 shows four lines—one due to MnO2?4 in Td symmetry and the other three to the split components of v3(T2) for MnO2?4 in Cs symmetry. I.R. spectrum of KBr: MnO2?4: Ca2+ shows another s of four lines—one due to MnO2?4 in Td symmetry and the other three to the v3(T2) mode of the ion in C2v symmetry. The v1(A1) line could not be observed in the i.r. spectra. |
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