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How Atomic Steps Modify Diffusion and Inter-adsorbate Forces: Empirical Evidence From Hopping Dynamics in Na/Cu(115)

Godsi, O.; Corem, G.; Kravchuk, T.; Bertram, C.; Morgenstern, K.; Hedgeland, H.; Jardine, A. P.; Allison, W.; Ellis, J. and Alexandrowicz, G. (2015). How Atomic Steps Modify Diffusion and Inter-adsorbate Forces: Empirical Evidence From Hopping Dynamics in Na/Cu(115). Journal of Physical Chemistry Letters, 6(20) pp. 4165–4170.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1021/acs.jpclett.5b01939
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Abstract

We followed the collective atomic-scale motion of Na atoms on a vicinal Cu(115) surface within a time scale of pico- to nanoseconds using helium spin echo spectroscopy. The well-defined stepped structure of Cu(115) allows us to study the effect that atomic steps have on the adsorption properties, the rate for motion parallel and perpendicular to the step edge, and the interaction between the Na atoms. With the support of a molecular dynamics simulation we show that the Na atoms perform strongly anisotropic 1D hopping motion parallel to the step edges. Furthermore, we observe that the spatial and temporal correlations between the Na atoms that lead to collective motion are also anisotropic, suggesting the steps efficiently screen the lateral interaction between Na atoms residing on different terraces.

Item Type: Journal Item
Copyright Holders: 2015 American Chemical Society
ISSN: 0022-3654
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Physics
Item ID: 47397
Depositing User: Holly Hedgeland
Date Deposited: 28 Sep 2016 14:56
Last Modified: 31 May 2019 22:11
URI: http://oro.open.ac.uk/id/eprint/47397
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