Highly Sensitive 2d X-ray Absorption Spectroscopy Via Physics Informed Machine Learning

This article discusses the challenges of analyzing low-absorption samples and how 2D TXM-XANES measurements can be used to map the valence state of Ni in a heterogeneous sample. The results can help fine-tune the synthesis process for LiNiO, a cathode material for lithium-ion batteries. Linear regression is used to fit the measured spectrum and the dynamic John-Teller effect has little effect on the results.