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AbstractAbstract
[en] The crystal structures of the R2Pd2Pb (R=Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, and Lu) compounds were determined using X-ray powder diffraction. The investigated compounds crystallize with Mo2FeB2 structure type (space group P4/mbm, Pearson code tP10). The importance of stabilization by polar intermetallic R-Pd bonding is underscored by a bonding analysis derived from electronic band structure calculations
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S0925838803010259; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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AbstractAbstract
[en] Energy transfer phenomenon from alpha species to beta species of uranyl nitrate hexahydrate (UNH) snap-frozen melt at 80K has been studied. Energy transfer has been found to occur from alpha and beta species of UNH to lanthanide ions at 80K and a dipole-dipole interaction mechanism has been suggested from alpha species to lanthanide ions at 298K. (author)
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4 refs.
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Journal Article
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Indian Journal of Pure and Applied Physics; ISSN 0019-5596; ; v. 19(11); p. 1107-1108
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Pant, R.P.; Kandpal, H.C.; Suri, D.K., E-mail: rppant@csnpl.ren.nic.in2002
AbstractAbstract
[en] Analysis and measurements of optical transmission of laser beam through ferrofluid have shown anomalous optical behavior of kerosene-based ferrofluid under the presence or absence of magnetic field. The optical transmission is polarization dependent and the observed pattern is attributed to dipole scattering. The spectral characteristic of ferrofluid indicates the dipole scattering and superparamagnetic behavior of the particles. The anomaly in the system is correlated with the magnetic, size distribution and other spectral measurements
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S0304885302006418; Copyright (c) 2002 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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AbstractAbstract
No abstract available
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2005 annual conference of the German Physical Society (DPG) during the World year of physics: Physics since Albert Einstein; Jahrestagung 2005 der Deutschen Physikalischen Gesellschaft (DPG) im World Year of Physics: Physik seit Albert Einstein; Berlin (Germany); 4-9 Mar 2005
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Conference
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Verhandlungen der Deutschen Physikalischen Gesellschaft; ISSN 0420-0195; ; CODEN VDPEAZ; v. 40(2); p. 384
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AbstractAbstract
[en] Energy transfer (ET) phenomenon has been studied from 5D0 and 5D1 states of Eu3+ to Ho3+ and Pr3+. The mechanism of ET has been found to be dipole-dipole in nature from both states. A temperature dependent study reveals that the efficiency of ET increases considerably at high temperature, however, the mechanism of ET remains dipole-dipole in character at all temperatures. (author)
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Journal Article
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Solid State Communications; ISSN 0038-1098; ; v. 40(6); p. 673-677
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AbstractAbstract
[en] The luminescence characteristic of Eu3+ in dimethyl sulphoxide at various temperatures have been investigated. Energy transfer phenomenon from Eu3+ to Nd3+ and Eu3+ to Ho3+ has been studied. The linear dependence of Psub(da) on C2 suggests a dipole-dipole interaction mechanism of energy transfer which is consistent with F K Fong and D J Diestler, theory of multipolar mechanism of energy transfer (1972). The linear dependence of Psub(da) on Csub(a) suggests a migration of excitation energy among donors at low acceptor concentration. (auth.)
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17 refs.
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Indian Journal of Pure and Applied Physics; ISSN 0019-5596; ; v. 17(9); p. 587-589
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AbstractAbstract
[en] Study of energy transfer from optically excited Eu3+→Ho3+ has been carried out in calibo glass. Probabilities and efficiencies of energy transfer from Eu3+→Ho3+ have been calculated from the life time and emission intensity of Eu3++Ho3+. At low acceptor concentrations Psub(da) varies linearly with Csub(a) showing migration of energy among donors. At high acceptor concentrations Psub(da) depends linearly on (Csub(a)+Csub(d))2, which is inconsistent with Fong and Diestler's theory of dipole-dipole mechanism of energy transfer. At low temperature emission intensity and life time increase, decreasing probability (Psub(d)) and efficiency (etaT) suggesting at room temperature the energy is transferred to the lattice by donor lowering life time and intensity. At high temperature no emission from higher levels of the donor is obtained suggesting blurred energy levels in the glass matrix. (Auth.)
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Journal Article
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Chemical Physics Letters; ISSN 0009-2614; ; v. 57(1); p. 50-53
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[en] Non-radiative energy transfer from optically excited Dy3+ to Ho3+ is studied in calibo glass. An experimental investigation is made to the nature of excited Dy3+ donors in presence of Ho3+ acceptors. The time dependence of luminescence decay following the pulsed excitation illustrates the transient behaviour, characteristic of diffusion-limited relaxation. The data are analysed to determine the probability for Dy3+ → Ho3+ energy transfer and the critical transfer distance for energy exchange. The results imply that the mechanism of donor-acceptor energy transfer is based on electric dipole-dipole interaction. The value of diffusion constant for dipole-dipole donor-donor interaction is also calculated. (author)
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Numerical Data
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Physica Status Solidi. A, Applied Research; ISSN 0031-8965; ; v. 52(2); p. 696-701
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[en] The energy transfer phenomenon has been studied from Tbsup(3+) to Prsup(3+) and Tbsup(3+) to Ersup(3+) in dimethyl sulphoxide. The linear dependence of probability of energy transfer (Psub(da)) on C2 (C being the sum of donor and acceptor concentrations) suggests a dipole-dipole mechanism of energy transfer which is consistent with F K Fong and D J Diestler theory (1972) of energy transfer, viz. that one donor ion interacts with two acceptor ions. The linear dependence of Psub(da) on Ca (acceptor concentration) shows migration of excitation energy among donors at low acceptor concentrations. (auth.)
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20 refs.
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Journal Article
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Indian Journal of Pure and Applied Physics; ISSN 0019-5596; ; v. 17(9); p. 583-586
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[en] The energy transfer phenomenon has been studied from Tb3+ → Nd3+ and Tb3+ → Ho3+ in DMSO. A diffusion limited dipole-dipole mechanism of energy transfer is suggested for both systems. At high acceptor concentrations, Psub(da) depends linearly on C2 consistent with the Fong and Diestler theory (1972) of energy transfer. However, at low acceptor concentrations the observations of time evolutions of Tb3+ luminescence decay following flash excitation has enabled the diffusion limited energy transfer from Tb3+ to Nd3+ and Tb3+ to Ho3+ to be examined in DMSO. (Auth.)
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Journal Article
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Journal of Luminescence; ISSN 0022-2313; ; v. 20(2); p. 207-213
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