Bragg Coherent Diffraction Imaging at the Advanced Photon Source with Dr. Ross Harder

Tuesday 28 May 2019, 13:00 → 14:00 Europe/Stockholm

MAX II (MAX IV)

X-ray Bragg coherent diffraction imaging has evolved into a powerful tool for local structure and strain characterization at the nanoscale. Unencumbered by high-resolution x-ray optics, or stringent sample preparation requirements, the technique has enabled imaging of strain in nano-scale materials at operando conditions. By measuring the coherent scattering in the vicinity of a Bragg peak of a crystal lattice and computationally inverting to an image, the technique has demonstrated quantitative strain resolution at the 10^-4 level with sub 10 nm spatial resolution. This talk will introduce the method and describe details of the coherent diffraction measurements and image retrieval process. I will also present a handful of recent studies performed at the Advanced Photon Source at Argonne National Laboratory where strain imaging was used to elucidate the mechanisms underlying catalytic activity in gold nanocrystals and the mechanisms of damage under focused ion beam milling.