The advancing in situ XAS technique made it possible to uncover the As-nZVI reaction pathway, especially capturing transient reaction process at subsecond scale. Combining the in situ XAS experimental data with computational chemistry enabled the reaction steps to be verified, clarifying the unambiguous identification of the transit reactive intermediates. Read more »
ALS Work Using Spectroscopy
These techniques are used to study the energies of particles that are emitted or absorbed by samples that are exposed to the light-source beam and are commonly used to determine the characteristics of chemical bonding and electron motion.
Cell ‘Fingerprinting’ Could Yield Long-Awaited Alzheimer’s Disease Diagnostic
A new application of infrared spectromicroscopy analyzes cells for signs of Alzheimer’s disease by measuring how the molecules in cells vibrate upon exposure to infrared light. The vibrational profile of each sample is so distinct and the difference between diseased and healthy cell samples is so visible that researchers liken the process to “cellular fingerprinting.” Read more »
Laser-Induced Cooperative Transition in Molecular Electronic Crystal
The cooperative tuning of a supramolecular electronic crystal enables access to a long-lived hidden conducting phase with a broad temperature range. Researchers demonstrate a dynamic and cooperative phase in K-TCNQ, with the control of pulsed electromagnetic excitation. A dedicated charge–spin–lattice decoupling is required to activate and subsequently stabilize the non-equilibrium phase. Read more »
A Two-Dimensional Room-Temperature Magnet
Researchers have made the world’s thinnest (one atom thick) magnet that’s chemically stable under ambient conditions. The two-dimensional material, magnetically characterized at the ALS, could enable big advances in next-generation memory devices, computing, spintronics, and quantum physics. Read more »
A Powerful Infrared Technique Broadens Its Horizons
Scattering-type scanning near-field optical microscopy (s-SNOM) focuses infrared light to dimensions below the diffraction limit, measuring properties with components perpendicular to the sample surface. Researchers have now devised a way to probe components parallel to the sample, where the technique has been less sensitive. Read more »
Autonomous Data Acquisition for Scientific Discovery
Researchers at large scientific facilities such as the ALS have applied a robust machine-learning technique to automatically optimize data gathering for a variety of experimental techniques. The work promises to enable experiments with large, complex datasets to be run more quickly, efficiently, and with minimal human intervention. Read more »
This Exotic Particle Had an Out-of-Body Experience; These Scientists Took a Picture of It
Scientists have taken the clearest picture yet of electronic particles that make up a mysterious magnetic state called a quantum spin liquid (QSL), in which electrons decompose into spin-like particles (spinons) and charge-like particles (chargons). The achievement could facilitate the development of superfast quantum computers and energy-efficient superconductors. Read more »
David Prendergast Wins 2021 Shirley Award
David Prendergast, an internationally recognized computational scientist whose first-principles calculations of x-ray spectra have helped with the interpretation of countless experiments done at the ALS, has been awarded the 2021 Shirley Award for Outstanding Scientific Achievement by the ALS Users’ Executive Committee. Read more »
Main Attraction: Scientists Create World’s Thinnest Magnet
A one-atom-thin 2D magnet that operates at room temperature could lead to new applications in computing and electronics—such as high-density, compact spintronic memory devices—and new tools for the study of quantum physics. X-ray experiments at the ALS characterized the material’s magnetic parameters under high temperature. Read more »
Tuning Semimetallicity Using Thin Films and Interfaces
With support from ALS data, scientists gained new insight into a semimetal’s unusual electronic behavior. The work lays out a basic strategy for engineering the band structures of semimetallic compounds using dimensional confinement and reveals a new way of creating two-dimensional electron/hole gases by exploiting interfacial bonding. Read more »
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