Debye colloquium - Dr. Leo Gross (IBM Zurich)

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Single molecule reactions and charge transitions investigated by AFM

Atomic force microscopy (AFM) with functionalized tips achieves atomic and bond-resolved resolution providing insights into structure [1], charge states [2], charge distribution [3], and bond-order relations [4] of individual molecules. By atom manipulation elusive molecules can be created. For example, we generated the elusive carbon allotrope cyclo[18]carbon resolved its debated structure [5]. On insulating substrates, charge-state control enables the characterization or aromaticity and conformation of single molecules in different oxidation states [6], measurement of the reorganization energy [7] and excited state spectroscopy [8].

References
[1]          L. Gross et al. Science 325, 1110 (2009)
[2]          L. Gross et al. Science 324, 1428 (2009)
[3]          F. Mohn et al. Nature Nano. 7, 227 (2012)
[4]          L. Gross et al. Science 337, 1326 (2012)
[5]          K. Kaiser et al. Science 365, 1299 (2019)
[6]          S. Fatayer et al. Science 365, 142 (2019)
[7]          S. Fatayer et al. Nature Nano. 13, 376 (2018)
[8]          S. Fatayer et al. Phys. Rev. Lett. 126, 176801 (2021)

Figure: Cyclo[18]carbon created by atom manipulation on bilayer NaCl on Cu(111). Bottom row: constant-height AFM measurements with a CO functionalized tip [5].
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Koningsberger building, Atlas lecture hall
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