SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session III: Surface dynamics I: Phase transitions and elementary processes
O 35.3: Poster
Dienstag, 2. März 2021, 10:30–12:30, P
Atomic Diffusion in O(2x2) on Ru(0001) - Spiral High Speed STM — •Leonard Gura1, Joachim Paier2, Zechao Yang1, Florian Kalass1, Matthias Brinker1, Heinz Junkes1, Markus Heyde1, and Hans-Joachim Freund1 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany — 2Humboldt Universität zu Berlin, Berlin, Germany
The diffusion of atomic oxygen on Ru(0001) has been studied over the last decades. Conventional Scanning Tunneling Microscopy (STM) gave hopping rates for oxygen vacancies in an O(2x2) adlayer in the order of 1/100 s [1].
Here we present new results on the dynamics in the O(2x2) layer on Ru(0001) at room temperature. We used a novel STM spiral scan pattern to avoid internal resonance frequencies of the microscope body. With this approach we increased the frame rate to 40 Hz.
Thanks to the high frame rate we were able to observe frequent jumps in the O(2x2) adlayer with hopping rates in the order of 1/1 s. In addition, we resolved intermediate states during single jump events. Based on Density Functional Theory (DFT) calculations, we provide a plausible O migration pathway.
Ideas for future studies include oxygen coverage and temperature dependent measurements. With refined spiral geometries and tip velocities we hope to further increase the scan speed to then monitor more dynamic processes at the atomic scale.
[1] Wintterlin, J. et al. (1997). Surface science, 394(1-3), 159-169 and references therein.