Ultrafast Diffusion at the Onset of Growth: O/Ru(0001)

Autor:	Jack Kelsall, John Ellis, Nadav Avidor, Peter S. M. Townsend, Andrew Jardine
Rok vydání:	2021
Předmět:	Crystallography Materials science Phase (matter) Diffusion 0103 physical sciences Atomic oxygen General Physics and Astronomy Substrate (electronics) Activation energy 010306 general physics 01 natural sciences Ultrashort pulse
Zdroj:	Physical Review Letters. 126
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.126.155901
Popis:	Nanoscopic clustering in a 2D disordered phase is observed for oxygen on Ru(0001) at low coverages and high temperatures. We study the coexistence of quasistatic clusters (with a characteristic length of $\ensuremath{\sim}9\text{ }\text{ }\AA{}$) and highly mobile atomic oxygen which diffuses between the energy-inequivalent, threefold hollow sites of the substrate. We determine a surprisingly low activation energy for diffusion of $385\ifmmode\pm\else\textpm\fi{}20\text{ }\text{ }\mathrm{meV}$. The minimum of the $\mathrm{O}\ensuremath{-}\mathrm{O}$ interadsorbate potential appears to be at lower separations than previously reported.
Databáze:	OpenAIRE
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