Exact inversion of partially coherent dynamical electron scattering for picometric structure retrieval.

ABSTRACT: The greatly nonlinear diffraction of high-energy electron probes focused to subatomic diameters frustrates the direct inversion of ptychographic data sets to decipher the atomic structure. Several iterative algorithms have been proposed to yield atomically-resolved phase distributions within slices of a 3D specimen, corresponding to the scattering centers of the electron wave. By pixelwise phase retrieval, current approaches do not only involve orders of magnitude more free parameters than necessary, but also neglect essential details of scattering physics such as the atomistic nature of the specimen and thermal effects. Here, we introduce a parametrized, fully differentiable scheme employing neural network concepts which allows the inversion of ptychographic data by means of entirely phys

SUBMITTER: Diederichs B 

PROVIDER: S-EPMC10762228 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature