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

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, , Citation J Purans et al 2009 J. Phys.: Conf. Ser. 190 012063 DOI 10.1088/1742-6596/190/1/012063

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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

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1742-6596/190/1/012063

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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10.1088/1742-6596/190/1/012063