Scientists report world’s first X-ray of a single atom in Nature
https://www.ohio.edu/news/2023/05/scientists-report-worlds-first-x-ray-single-atom-nature
... have taken the world’s first X-ray SIGNAL (or SIGNATURE) of just one atom.
Paper (2023-05-31): Characterization of just one atom using synchrotron X-rays
https://www.nature.com/articles/s41586-023-06011-w
Discussion: https://news.ycombinator.com/item?id=36474512
YouTube (for reference): A Better Way To Picture Atoms, https://www.youtube.com/watch?v=W2Xb2GFK2yc