Careful simultaneous fitting of different high-symmetry EDC measurements, in concert with the structural understanding gleaned from ncAFM & LEED characterization, allowed us to tease out a feature with bandwidth 20 meV, which was surprising to us given that we did the ARPES at room temperature.
Bruce Cowie & Anton Tadich made it possible to break into this kind of measurement with just a week of time; Anton has been instrumental in supporting the analysis that was required to get this one across the finish line.
Hellerstedt, J., et. al. (2022). Direct observation of narrow electronic energy band formation in 2D molecular self-assembly. Nanoscale Advanceshttps://doi.org/10.1039/D2NA00385F
The images we took for this study inspired this work to develop a lightweight script to count the molecules we observed, and categorize them.
Our personal journey of computer vision rediscovery led us to Zernike moments, a rotationally invariant basis set that solves the problem of identifying the same molecules with relative rotations, in an image.
We put some effort into making this module user-friendly, the example scripts offer a reasonable template to apply to any old SXM file you might want to histogram.
Hellerstedt, J., et. al. (2022). Counting Molecules: Python based scheme for automated enumeration and categorization of molecules in scanning tunneling microscopy images. Software Impactshttps://doi.org/10.1016/j.simpa.2022.100301
Marina Castelli studied the phthalocyanine containing magnesium (MgPc) via 5K scanned probe microscopies extensively during her PhD.
‘Routine’ STM characterisation showed that the molecules were interacting with one another on the Ag100 surface.
ncAFM showed identical contrast for all molecules, pointing to an electronic origin to the observed changes in appearance.
Our key observation was to track the shape of the occupied LUMO for different pairwise distances, an electronic feature that otherwise remained isoenergetic.
With multipass dI/dV mapping we were able to quantitatively track from four- to two-fold rotational symmetry, over distances out to ~3 nm. We found the spatial extent of this attractive hybridization quite surprising.