Femtometer accuracy EXAFS measurements: Isotopic effect in the first, second and third coordination shells of germanium

doi:10.1088/1742-6596/190/1/012063

Femtometer accuracy EXAFS measurements: Isotopic effect in the first, second and third coordination shells of germanium

J Purans et al 2009 J. Phys.: Conf. Ser. 190 012063 (6pp) doi: 10.1088/1742-6596/190/1/012063

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J Purans¹, J Timoshenko¹, A Kuzmin¹, G Dalba², P Fornasini², R Grisenti², N D Afify², F Rocca³, S De Panfilis^4,5, I Ozhogin⁶ and S I Tiutiunnikov⁷
¹ Institute of Solid State Physics, University of Latvia, Kengaraga 8, LV-1063 Riga, Latvia
² Dip. di Fisica dell'Università di Trento, Via Sommarive 14, I-38050 Povo (Trento), Italy
³ Istituto di Fotonica e Nanotecnologie del CNR, Sezione "FBK-CeFSA" di Trento, Povo (Trento), Italy
⁴ Research Center Soft INFM-CNR, c/o Università di Roma La Sapienza, I-00185 Roma, Italy
⁵ European Synchrotron Radiation Facility, BP 220, 38043 Grenoble cedex 9, France
⁶ Institute of Molecular Physics, Russian Research Centre "Kurchatov Institute", 123182 Moscow, Russian Federation
⁷ Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russian Federation
E-mail: purans@cfi.lu.lv

Abstract. The analysis of the EXAFS signals from ⁷⁰Ge and ⁷⁶Ge has evidenced the low-temperature effect of isotopic mass difference on the amplitude of relative atomic vibrations. This effect is reflected in the difference of the Debye-Waller factors of the first three coordination shells, and on the difference of nearest-neighbour average interatomic distances, evaluated with femtometer accuracy. The experimental results are in agreement with theoretical expectations.

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Femtometer accuracy EXAFS measurements: Isotopic effect in the first, second and third coordination shells of germanium

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