SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 14: Poster Session I: Nanostructures at surfaces I
O 14.4: Poster
Montag, 1. März 2021, 10:30–12:30, P
Kinetically controlled on-surface playground of nanostructure growth — •Aisha Ahsan1, Fatemeh Mousavi Mousavi1, Thomas Nijs1, Sylwia Nowakowska1, Olha Popova1, Aneliia Wäckerlin1, Jonas Björk2, Lutz Gade3, and Thomas Jung1,4 — 1Department of Physics, University of Basel, 4056 Basel, Switzerland — 2Department of Physics, Chemistry and Biology, IFM, Linköping University, Linköping 581 83, Sweden — 3Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany — 4Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
Rare gases on metals serve as models for understanding mass transport and crystal growth of adsorbates on surfaces, while LT-STM studies enriched our knowledge how rare gases behave at atomic level. Deep insight has been gained into the diffusion mechanisms of van der Waals adsorbates on a complex energy landscape defined by an on-surface coordination network architecture. Using Xe as the model case, a complex re-distribution/re-nucleation and coarsening/growth phenomena has been investigated where the adsorbate can be evaporated/re-captured into/from *gas phases* or *lattice gas phases* between 5K and 50K showing hopping motion between different confinements (0D), along boundaries of network (1D) and across whole network backbone (2D). After heating to ~50K then back to 5K, atoms are exclusively found in the thermally minimal state of 12 Xe atoms filling one pore, a process which we assign to the analogon of Ostwald ripening/coarsening transition which clearly limited in size.