Low Temperature Surface Diffusion on Metallic Surfaces

Abstract : We present a study of the atomic surface diffusion at low temperature of Cr adatoms deposited on Cu(100), Cu(111), and Au(111) surfaces. Time-dependent X-ray magnetic circular dichroism (XMCD), Monte Carlo simulations, and the Kimball−Shortley iterative method are used to evidence a mechanism of quantum tunneling involved in the Cr adatom surface diffusion at temperatures below 40 K. We show that the XMCD line shape is correlated to the atomic configuration of Cr deposited on a metallic surface. A diffusion rate ranging from 0.03 Hz for Cu(100) to 30 Hz for Au(111) at 10 K is reported from the time evolution of the XMCD line shape. A quantum equation of motion for the Cr adatom is derived and solved by using a Kimball−Shortley iterative method. Good agreement between the calculated Bohr periods and the experimental diffusion rates is reported.
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Article dans une revue
Journal of Physical Chemistry C, American Chemical Society, 2009, 123 (11), pp.4461-4467. 〈10.1021/jp805674n〉
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Contributeur : Emilie Gaudry <>
Soumis le : vendredi 11 avril 2014 - 21:22:25
Dernière modification le : mardi 18 avril 2017 - 15:25:47

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Hervé Bulou, Fabrice Scheurer, C. Boeglin, Philippe Ohresser, S. Stanescu, et al.. Low Temperature Surface Diffusion on Metallic Surfaces. Journal of Physical Chemistry C, American Chemical Society, 2009, 123 (11), pp.4461-4467. 〈10.1021/jp805674n〉. 〈hal-00978018〉

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