• R M Dixit

      Articles written in Proceedings – Section A

    • On the fluorescence spectrum of di-caesium uranyl nitrate at 77° K

      R M Dixit

      More Details Abstract Fulltext PDF

      It is shown that the fluorescence spectrum of Cs2UO2(NO3)4 consists mainly of sequences starting off from the resonance bandR followed by ‘C’ the bending frequency and each consisting of bands which can be assigned as (A, B, A + C), (2A, A + B, 2A + C), (3A, 2A + B, 3A + C), etc., where A is the symmetric vibration frequency,B the antisymmetric frequency and C the bending frequency of the linear UO2/++ ion in this lattice. In addition are observed several fundamental frequencies of the nitrate ion and the lattice either alone or coupled to the symmetric frequency A and its overtones. The relevant constants are:

    • On the fluorescence spectrum of uranyl ion contained in some rare-earth chlorides

      R M Dixit

      More Details Abstract Fulltext PDF

      The mutual effect of the rare-earth ion and the uranyl ion on each other is studied by the fluorescence spectra of 10% UO2Cl2 contained in the rare-earth chlorides (La, Sm, Eu, Dy and Tb). While the spectra of rare-earth ions remain unchanged in the presence of 10% UO2Cl2 the spectrum of the uranyl ion is very much influenced. The spectrum now consists, instead of discrete bands, groups of diffuse bands. Analysis shows that in the case of Y, La and Eu, which all show a similar effect, the resonance band is shifted towards the longer wavelength side to 20319 cm.−1 and the symmetric frequency is reduced to ∼877. In the case of Sm, Dy and Tb the resonance band is further shifted to 19255 cm.−1 and the symmetric frequency is reduced to 841. In the case of UO2Cl2 the resonance band is at 20537 cm.−1 and the symmetric frequency is 883

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