EXAFS measurements with femtometer accuracy: isotopic effect in the first, second, and third coordination shells of germanium (Contributo in atti di convegno)

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  • EXAFS measurements with femtometer accuracy: isotopic effect in the first, second, and third coordination shells of germanium (Contributo in atti di convegno) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Alternative label
  • J. Purans, J. Timoshenko, A. Kuzmin, G. Dalba, P. Fornasini, R. Grisenti, N.D. Afify, F. Rocca, S. De Panfilis, V.I. Ozhogin, S.I. Tiutiunnikov (2009)
    EXAFS measurements with femtometer accuracy: isotopic effect in the first, second, and third coordination shells of germanium
    in XAFS14 - XIX “International Conference on X-ray Absorption fine Structure” , 26-31 July 2009, Camerino, MC (Italia)
    (literal)
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  • J. Purans, J. Timoshenko, A. Kuzmin, G. Dalba, P. Fornasini, R. Grisenti, N.D. Afify, F. Rocca, S. De Panfilis, V.I. Ozhogin, S.I. Tiutiunnikov (literal)
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  • Abstract:Recently we have shown that isotopic effect in polycrystalline germanium can be successfully probed by the extended x-ray absorption fine structure (EXAFS) technique with femtometer accuracy (see highlight ESRF 2008). The analysis of the first coordination shell in two powders 70Ge and 76Ge has evidenced the effect of isotopic mass difference on the amplitude of relative atomic vibrations, reflected in the temperature dependence of the difference of Debye-Waller factors, and on the difference of nearest-neighbor average interatomic distances. In this work we extend our analysis of the available Ge K-edge EXAFS data[1] to the second and third coordination shells, where a contribution of multiple-scattering (MS) effects into EXAFS signal is expected. The Debye-Waller (DW) factors have been obtained for two isotopes of 70Ge and 76Ge using the best fit procedure of the EXAFS signals within the MS approximation in the temperature range from 20 to 300K. The determined temperature dependencies of the DW factors have been used to calculate the characteristic frequencies within the Einstein model. The obtained values of the characteristic frequencies are in good agreement with those expected from the variation of the isotopic mass. (literal)
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  • Oral Communication ( J. Purans ), Session P6.3 (literal)
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  • Book of Abstract (literal)
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  • J. Purans, J. Timoshenko, A. Kuzmin, Institute of Solid State Physics, University of Latvia, Riga, Latvia; P. Fornasini, R. Grisenti, N.D. Afify, Dipartimento di Fisica dell'Università di Trento,Via Sommarive 14, I-38050 Povo (Trento), Italy; F. Rocca, IFN-CNR, Istituto di Fotonica e Nanotecnologie, Sezione ”FBK-CeFSA” di Trento, I-38050 Povo (Trento), Italy; S. De Panfilis, Research Center Soft INFM-CNR, c/o Università di Roma La Sapienza, I-00185, Roma, Italy; European Synchrotron Radiation Facility, Grenoble, France; V.I. Ozhogin, Institute of Molecular Physics, Russian Research Centre “Kurchatov Institute”, 123182 Moscow, Russian Federation; S.I. Tiutiunnikov, Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russian Federation (literal)
Titolo
  • EXAFS measurements with femtometer accuracy: isotopic effect in the first, second, and third coordination shells of germanium (literal)
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