Description:

In this talk, we will cover the basic principles governing x-ray Bragg coherent diffraction imaging at modern synchrotron light sources that enable lattice defects such as strain to be imaged in nanoscale crystals. We will also cover the principles of x-ray photon correlation spectroscopy by which time-resolved speckle patterns are used to extract dynamics of structure in materials. We will introduce coherent x-ray beams and describe their interaction with crystals in the wide angle Bragg geometry. This interaction results in intricate interference patterns that encode elements of the morphology, strain state, and dynamics of the illuminated volume. Recent science examples from both methods will be discussed in the areas of phase transformations, catalysis, and single crystal synthesis, as will the outlook for future experiments at the soon-to-be-upgraded Advanced Photon Source synchrotron at Argonne.

Speaker: Stephan Hruszkewycz, Physics Leader 2, Argonne National Laboratory

Host: Chris Jacobsen