Kim’s RIXS Technique Probes Electron Dynamics for New Discoveries

Key Takeaways

• Sector 27 became first beamline operational after APS Upgrade
• RIXS now captures electron, spin, and orbital dynamics faster
• Improved energy resolution enables detection of collective spin excitations
• Kim’s rapid prototyping accelerates new measurement modes for users
• RIXS advances superconductivity and quantum computing material design

Pulse Analysis

Resonant inelastic X‑ray scattering (RIXS) has emerged as a cornerstone technique for probing the microscopic interactions that dictate material properties. By measuring how X‑ray photons lose energy after scattering off a sample, RIXS reveals lattice vibrations, charge transfers, spin flips, and orbital rearrangements in a single experiment. This multi‑modal insight is especially valuable for designing next‑generation superconductors and quantum‑computing platforms, where subtle electron correlations can make or break performance. Jung Ho Kim’s expertise in refining RIXS bridges fundamental physics with practical material engineering, positioning the method as a go‑to diagnostic for complex quantum systems.

The recent APS Upgrade (APS‑U) dramatically amplified RIXS capabilities at Argonne’s Sector 27 beamline. Brighter, more coherent X‑ray beams and upgraded optics now deliver sub‑10‑meV energy resolution and sub‑micron beam spots, cutting measurement times by orders of magnitude. Researchers can capture transient spin excitations that previously required large‑scale neutron facilities, enabling on‑site, high‑throughput experiments. Kim’s leadership in deploying these enhancements means users can iterate experimental designs within days, accelerating the feedback loop between theory and observation and fostering rapid innovation across condensed‑matter research.

Beyond the laboratory, the upgraded RIXS infrastructure reinforces U.S. competitiveness in the global quantum materials race. Faster, higher‑resolution data translate into shorter development cycles for commercial technologies such as low‑loss power transmission lines and fault‑tolerant qubits. Kim’s commitment to expanding measurement modes—like time‑resolved and nano‑focused RIXS—opens pathways for industry‑academic collaborations, attracting investment and talent to the national laboratory ecosystem. As material challenges become increasingly complex, the ability to visualize electron, spin, and orbital dynamics in real time will be a decisive advantage for both scientific discovery and market‑driven innovation.