Physicists have finally done what once sounded like science fiction: they have read the X-ray “fingerprint” of a single atom, isolating the signal of one of nature’s smallest building blocks from the ...

This image shows (a) the Nature magazine cover; (b) the single atom X-ray mechanism; (c) a supramolecular ring with one iron atom; (d) X-ray spectra of one iron atom; (e) a terbium dimer complex; (f) ...