Nuclear Resonant Scattering (NRS) is a synchrotron X-ray technique that uses very sharp, resonant X-ray energies to excite specific atomic nuclei (like iron-57). When these nuclei re-emit the X-rays, the signal reveals hyperfine interactions—tiny magnetic and electric effects at the atomic scale.
It’s powerful for studying magnetism, vibrations, and local environments in materials and biological systems, far beyond what normal X-rays can show.