scatterem

Abstract

scatterem provides two things that share a scattering-matrix substrate. Reconstruction. Direct (single-side-band) ptychography, tilt-corrected dark-field imaging, and their SSNR-weighted Wiener fusion for 4D-STEM data, giving images with both low-frequency phase contrast and high-frequency detail. Forward simulation. Core-loss STEM-EELS by transition-potential multislice and by PRISM, including the bi-partitioned BiP-PRISM algorithm: both the probe-forming scattering matrix and the transposed detector matrix are computed on a sparse hex-ring parent set and reconstructed by natural-neighbour interpolation on a small window around the ionised atom. This makes full-resolution elemental mapping, energy-filtered four-dimensional datasets and momentum-resolved output reachable within a single GPU's memory. The public tree is generated from a private development repository by an explicit manifest, so what is published is decided file by file rather than by omission.