High-precision atomic image reconstruction from photoelectron hologram of O on W(110) by SPEA-L1

In recent years, the analysis of atomic arrangements of dopants using photoelectron holography has attracted much attention. A three-dimensional atomic image around the photoelectron-emitting atoms can be reconstructed from the photoelectron hologram. In this method, the theory of reconstructing an atomic arrangement from a photoelectron hologram is important. The recently developed Scattering Pattern Extraction Algorithm using L1 regularization (SPEA-L1) is capable of precisely reconstructing atomic images. We evaluated the accuracy of SPEA-L1 by comparing it with the Barton method using photoelectron holograms of W(110)-O. As a result, it was observed that SPEA-L1 could accurately reproduce an atomic image with a width as small as a fraction of the width of the reconstructed atomic positions compared to the Barton method. The obtained W(110)-O structure agreed well with the structure obtained by Low Energy Electron Diffraction(LEED) and calculations with an accuracy of 0.1 Å.