SAMOP 2021 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 1: Atomic clusters / Collisions, scattering, correlation
A 1.2: Hauptvortrag
Montag, 20. September 2021, 11:15–11:45, H1
Scattering of twisted x-rays from a crystal — •Anton Peshkov1,2, Stephan Fritzsche3,4, and Andrey Surzhykov1,2 — 1Technische Universität Braunschweig, Germany — 2Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 3Helmholtz-Institut Jena, Germany — 4Friedrich-Schiller-Universität Jena, Germany
The elastic scattering of x-rays by bound atomic electrons is known to be an excellent probe of the structure of matter. One of the most intriguing example here is x-ray crystallography used to determine the arrangement of atoms in a crystal. The essential physics of this process has been known and understood for many years for the incident plane-wave radiation. However, this is not the case for twisted light beams that carry a nonzero projection of the orbital angular momentum (OAM) onto their propagation direction and whose intensity pattern has an annular character. In order to understand how the scattering from crystals depends on the “twistedness” of incident x-rays, we present here a theoretical analysis of the elastic scattering of Bessel beams from a single crystal of lithium. Our numerical calculations show that the scattering cross section is sensitive to the OAM projection of twisted beams and differs from the standard plane-wave case when the size of the crystal is reduced to the nanometer scale.
[1] A. A. Peshkov et al., Phys. Scr. 94, 105402 (2019).