# Interplay of weak interactions in the atom-by-atom condensation of xenon within quantum boxes

Nowakowska, Sylwia and Waeckerlin, Aneliia and Kawai, Shigeki and Ivas, Toni and Nowakowski, Jan and Fatayer, Shadi and Waeckerlin, Christian and Nijs, Thomas and Meyer, Ernst and Bjork, Jonas and Stohr, Meike and Gade, Lutz H. and Jung, Thomas A.. (2015) Interplay of weak interactions in the atom-by-atom condensation of xenon within quantum boxes. Nature communications, 6. p. 6071.

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Official URL: http://edoc.unibas.ch/40354/

Condensation processes are of key importance in nature and play a fundamental role in chemistry and physics. Owing to size effects at the nanoscale, it is conceptually desired to experimentally probe the dependence of condensate structure on the number of constituents one by one. Here we present an approach to study a condensation process atom-by-atom with the scanning tunnelling microscope, which provides a direct real-space access with atomic precision to the aggregates formed in atomically defined quantum boxes. Our analysis reveals the subtle interplay of competing directional and nondirectional interactions in the emergence of structure and provides unprecedented input for the structural comparison with quantum mechanical models. This approach focuses on-but is not limited to-the model case of xenon condensation and goes significantly beyond the well-established statistical size analysis of clusters in atomic or molecular beams by mass spectrometry.