Radiative Transition

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J Ramakrishna - One of the best experts on this subject based on the ideXlab platform.

  • optical absorption of nd3 sm3 and dy3 in bismuth borate glasses with large Radiative Transition probabilities
    Optical Materials, 2002
    Co-Authors: M B Saisudha, J Ramakrishna
    Abstract:

    Abstract This paper reports on the optical properties of Nd3+, Sm3+ and Dy3+ in bismuth borate glasses, with Bi2O3 content varying from 30 to 60 mol%. The variation of the optical properties with composition plays a dominant role in determining a good laser host material. The variation of the Judd–Ofelt intensity parameters Ω t (t=2,4,6) and the Radiative Transition probabilities and the hypersensitive band positions, with composition, have been discussed in detail. The changes in position and intensity parameters of the Transitions in the optical absorption spectra are correlated to the structural changes in the host glass matrix. The variation of Ω 2 with Bi2O3 content has been attributed to changes in the asymmetry of the ligand field at the rare earth ion site and to the changes in their rare earth–oxygen (R–O) covalency, whereas the variation of Ω 6 strongly depends on nephlauxetic effect. The shift of the hypersensitive band shows that the covalency of the R–O bond increases with increase of Bi2O3 content, due to increased interaction between the rare earth ions and the non-bridging oxygens. The Radiative Transition probabilities of the rare earth ions are large in bismuth borate glasses, suggesting their suitability for laser applications.

M P Aggarwal - One of the best experts on this subject based on the ideXlab platform.

  • structure and optical absorption of sm3 and nd3 ions in cadmium bismuth borate glasses with large Radiative Transition probabilities
    Optical Materials, 2012
    Co-Authors: Ashish Agarwal, Sujata Sanghi, M P Aggarwal
    Abstract:

    Abstract Glasses having compositions 20CdO⋅xBi2O3⋅(79.5 − x)B2O3 (15 ⩽ x ⩽ 35) doped with 0.5 mol% of Sm3+ and Nd3+ ions were prepared by melt quench technique. The amorphous nature of the glasses was confirmed by X-ray diffraction studies. The spectroscopic properties of the glasses were investigated using optical absorption and fluorescence spectra. The structural investigations of these glasses were carried out by recording the Fourier transform infrared spectra. The Judd–Ofelt intensity parameters Ωλ (λ = 2, 4, 6) and other Radiative properties like Radiative Transition probability, Radiative life time, branching ratio and stimulated emission cross-section of the prepared glasses have been calculated. The variation of Ω2 with Bi2O3 content has been attributed to changes in the asymmetry of the ligand field at the rare earth ion site and to the changes in their rare earth oxygen (RE-O) covalency. The shift in the hypersensitive band shows that the covalency of the RE-O bond increases with increase of Bi2O3 content, and it is attributed to the increased interaction between the rare earth ions and the non-bridging oxygens (NBO’s). The Radiative Transition probabilities of the rare earth ions are large in cadmium bismuth borate glasses, suggesting their suitability as a potential candidate for laser application. Further, the FTIR results reveal that the glasses have BO3, BO4 and non-bridging oxygen as local structure.

H Sundu - One of the best experts on this subject based on the ideXlab platform.

  • Radiative Transition of negative to positive parity nucleon
    arXiv: High Energy Physics - Phenomenology, 2015
    Co-Authors: Kazem Azizi, H Sundu
    Abstract:

    We investigate the $N^{\ast}(1535)\rightarrow N\gamma$ Transition in the framework of light cone QCD sum rules. In particular, using the most general form of the interpolating current for the nucleon as well as the distribution amplitudes of the photon, we calculate two Transition form factors responsible for this channel and use them to evaluate the decay width and branching ratio of the Transition under consideration. The result obtained for the branching fraction is in a good consistency with the experimental data.

  • Radiative Transition of negative to positive parity nucleon
    Physical Review D, 2015
    Co-Authors: Kazem Azizi, H Sundu
    Abstract:

    We investigate the N(1535) → Nγ Transition in the framework of light cone QCD sum rules. In particular, using the most general form of the interpolating current for the nucleon as well as the distribution amplitudes of the photon, we calculate two Transition form factors responsible for this channel and use them to evaluate the decay width and branching ratio of the Transition under consideration. The result obtained for the branching fraction is in a good consistency with the experimental data. PACS number(s): 13.40.Gp, 13.30.Ce, 14.20.Dh, 11.55.Hx e-mail:kazizi@dogus.edu.tr, kazem.azizi@cern.ch e-mail:hayriye.sundu@kocaeli.edu.tr

A Hibbert - One of the best experts on this subject based on the ideXlab platform.

  • Radiative Transition rates for the forbidden lines in fe ii
    Astronomy and Astrophysics, 2011
    Co-Authors: A Hibbert
    Abstract:

    Aims. We report electric quadrupole and magnetic dipole Transitions among the levels belonging to 3d 6 4s, 3d 7 and 3d 5 4s 2 configurations of Fe II in a large scale configuration interaction (CI) calculation. Methods. The CIV3 code developed by Hibbert and coworkers is used to determine configuration interaction wave functions for these levels: for the optimisation of two different sets of orbitals based on alternative choices of the 3d function, for creating and diagonalising the Hamiltonian matrices and finally for calculating Transition probabilities. Results. Where possible, we have used experimental energies, not only for Transition energies but also to enhance the accuracy of our ab initio CI expansions. We compare our results with those of other authors, and discuss differences between them. The good agreement between our results obtained for the same Transitions but with different d-functions indicates that we have treated the state dependence of the d-functions sufficiently well. Most of our results are available in electronic form as an appendix to the paper. Conclusions. Our analysis of our own results and those of others suggests that many of our Transition rates are more accurate than the rather conservative 20−30% we have stated in the text, though in a small proportion of Transitions, we could not justify an accuracy greater than this.

M B Saisudha - One of the best experts on this subject based on the ideXlab platform.

  • optical absorption of nd3 sm3 and dy3 in bismuth borate glasses with large Radiative Transition probabilities
    Optical Materials, 2002
    Co-Authors: M B Saisudha, J Ramakrishna
    Abstract:

    Abstract This paper reports on the optical properties of Nd3+, Sm3+ and Dy3+ in bismuth borate glasses, with Bi2O3 content varying from 30 to 60 mol%. The variation of the optical properties with composition plays a dominant role in determining a good laser host material. The variation of the Judd–Ofelt intensity parameters Ω t (t=2,4,6) and the Radiative Transition probabilities and the hypersensitive band positions, with composition, have been discussed in detail. The changes in position and intensity parameters of the Transitions in the optical absorption spectra are correlated to the structural changes in the host glass matrix. The variation of Ω 2 with Bi2O3 content has been attributed to changes in the asymmetry of the ligand field at the rare earth ion site and to the changes in their rare earth–oxygen (R–O) covalency, whereas the variation of Ω 6 strongly depends on nephlauxetic effect. The shift of the hypersensitive band shows that the covalency of the R–O bond increases with increase of Bi2O3 content, due to increased interaction between the rare earth ions and the non-bridging oxygens. The Radiative Transition probabilities of the rare earth ions are large in bismuth borate glasses, suggesting their suitability for laser applications.