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000056025 0247_ $$2DOI$$a10.1016/j.susc.2007.01.004
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000056025 084__ $$2WoS$$aChemistry, Physical
000056025 084__ $$2WoS$$aPhysics, Condensed Matter
000056025 1001_ $$0P:(DE-Juel1)VDB14875$$aIkonomov, J.$$b0$$uFZJ
000056025 245__ $$aIsland coalescence and diffusion along kinked steps on Cu(001): Evidence for a large kink Ehrlich-Schwoebel barrier
000056025 260__ $$aAmsterdam$$bElsevier$$c2007
000056025 300__ $$a1403 - 1408
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000056025 520__ $$aUsing temperature-variable scanning tunneling microscopy, we studied the coalescence of vacancy islands on Cu(001) in ultra-high vacuum. From the temperature dependence of the relaxation of merged vacancy islands to the equilibrium shape we obtain an activation energy of the island coalescence process of 0.76 eV. From that value we deduce an activation energy for the atomic hopping coefficient of E-rh = 0.89 eV. Comparing our result with previous STM data on step fluctuations with dominant diffusion along straight step segments (E-rh = 0.68 eV; [M. Giesen, S. Dieluweit, J. Mol. Catal. A: Chem. 216 (2004) 263]) and step fluctuations with kink crossing (E-rh = 0.9 eV; [M. Giesen-Seibert, F. Schmitz, R. Jentjens, H. Ibach, Surf. Sci. 329 (1995) 47]), we conclude that there is a large extra barrier for diffusion of atoms across kinks on Cu(001) of the order of 0.23 eV. This is the first direct experimental evidence for the existence of a large kink Ehrlich-Schwoebel barrier on Cu(001). (c) 2007 Elsevier B.V. All rights reserved.
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000056025 65320 $$2Author$$aSTM
000056025 65320 $$2Author$$adiffusion
000056025 65320 $$2Author$$acopper
000056025 65320 $$2Author$$aislands
000056025 65320 $$2Author$$acoalescence
000056025 65320 $$2Author$$akinks
000056025 65320 $$2Author$$asurface instabilities
000056025 65320 $$2Author$$aEhrlich-Schwoebel barrier
000056025 7001_ $$0P:(DE-Juel1)VDB5995$$aStarbova, K.$$b1$$uFZJ
000056025 7001_ $$0P:(DE-Juel1)4744$$aGiesen, M.$$b2$$uFZJ
000056025 773__ $$0PERI:(DE-600)1479030-0$$a10.1016/j.susc.2007.01.004$$gVol. 601, p. 1403 - 1408$$p1403 - 1408$$q601<1403 - 1408$$tSurface science$$v601$$x0039-6028$$y2007
000056025 8567_ $$uhttp://dx.doi.org/10.1016/j.susc.2007.01.004
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