Resolving atomic diffusion in Ru(0001)-O(2 x 2) with spiral high-speed scanning tunneling microscopy

Article

关键词: TOTAL-ENERGY CALCULATIONS;    SURFACE-DIFFUSION;    METAL-SURFACES;    ADSORPTION;    OXYGEN;    GAS;    CHEMISORPTION;    CATALYSIS;    OXIDATION;    DYNAMICS;   

DOI  :  10.1103/PhysRevB.105.035411

来源: SCIE

【 摘 要 】

An intermediate state in atomic diffusion processes in the O(2 x 2) layer on Ru(0001) is resolved with spiral high-speed scanning tunneling microscopy (STM). The diffusion of atomic oxygen in the adlayer has been studied by density functional theory and STM. Transition state theory proposes a migration pathway for the diffusion in the oxygen adlayer. With spiral scan geometries-a new approach to high-speed STM-the oxygen vacancy mobility on the highly covered Ru(0001) surface is determined to be in the range of 0.1 to 1 Hz. Experimental evidence for the intermediate state along the oxygen diffusion pathway is provided in real space and real time.

【 授权许可】

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