Welcome to our google-sites page on strategies for analyzing electron scattering data from the nanoworlds of YOUR NEIGHBORHOOD in the Milky Way, as complement to the electron detectives webpage here

Some nanostructure models printed in three dimensions.
The image above shows 3D ``photocopies" of some molecular-models constructed with Mathematica, and printed out with a scale size of 1 Angstrom = 2 millimeters. The top two copies are silicon cubes with faceted-truncations, plus (only on the right hand side) with facets outlined in white. At bottom left is an m=4 graphite hex-prism with white van der Waals bonds and 4 graphene-sheets, which sheets have 4 carbon atoms (paired) along each of their 6 edges. The printout at bottom-right is another silicon model, this time with a silicon {110} face at top and silicon {111} facets along the sides, while the center-model is a face-centered-cubic palladium "bow-tie", extracted from a 10 bow-tie icosahedral-twin.

The figure at right analyzes the direct-space location, and vector phase-gradients, of a selected range of periodicities (green circle) in the power-spectrum of a "zone-plate" image (top left panel), using our digital darkfield plugins for the freely-available technical image analysis program ImageJ. The complex darkfield image (lower left panel) uses logarithmic complex-color to display amplitude & phase for each pixel. Phase-gradient or periodicity-strain is broken into isotropic (top right panel) & shear (bottom right panel) components, with compression red, tension cyan, CCW-twist indigo, and CW-twist chartreuse.
The above figure is from Mathematica work on the contrast transfer function in a given experimental image, based on the transfer function zeros which show up in regions with diffuse scattering. A diagnostic projected-potential & diffraction-pattern are on the left. The model point-spread (top-center panel) & contrast-transfer (bottom-center panel) functions are shown in logarithmic complex-color. Strong phase-object microscope image & image power-spectrum are on the right.

Home link: electron detective adventures
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pf Define Project January 18, 2014  
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  • JS/HTML5 explorer update We've updated unknown 5, and added a BF-HREM/DF-STEM toggle for comparison of phase & amplitude contrast effects by in effect reversing the direction of electrons traveling through ...
    Posted Aug 5, 2015, 10:55 AM by pb fraundorf
  • electron optics challenges We've now added a list of data acquisition/analysis challenges to our javascript nanostructure explorer page, and also specimen-state tilt-readouts to the explorer itself. What kinds of ...
    Posted Jul 19, 2014, 1:36 PM by pb fraundorf
  • javascript electron optics We've now started a section up here about our work on real-time web-based simulators for electron-microscope data-acquisition and image-analysis. For instance, our nanostructure explorer ...
    Posted Jul 7, 2014, 7:40 AM by pb fraundorf
  • ASCI 2014 debrief I really enjoyed the meeting during several dry spring days in Seattle. Slides for my talk may be found here on the page about Analytic approaches.
    Posted Jun 1, 2014, 11:27 AM by pb fraundorf
  • ASCI2014 in May This year I get to attend the PREMIER Network's ASCI (Advances in Structural and Chemical Imaging) 2014 meeting on 27-28 May in Seattle WA.
    Posted Apr 8, 2014, 12:22 PM by pb fraundorf
Showing posts 1 - 5 of 10. View more »