Tag: Spectroscopy
Ultrafast spectroscopy directly measures Raman phonon anharmonicity
What the study found The study reports that ultrafast double pump-probe spectroscopy can directly observe frequency shifts of Raman phonons, which are lattice vibrations that can be detected by light, as a function of oscillation amplitude. It also reports that this approach can separate coherent effects from quasi-harmonic sources such as temperature and changes in…
Low-footprint NIR spectroscopy enables quasi-simultaneous biosensing
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What the study found The study presents a near-infrared (NIR) multimodal, low-footprint spectroscopy setup that can measure NIR fluorescence and absorption. It also reports that the setup provides quasi-simultaneous access to both types of spectra. Why the authors say this matters The authors say NIR techniques are less widespread than visible-light methods because detectors, microscopes,…
Criegee intermediates show environment-dependent spectral shifts
What the study found The study found that the dynamics and infrared spectroscopy of two Criegee intermediates, H2COO and CH3CHOO, depend on the surrounding environment. In water droplets, both species can move easily between surface and interior positions, while on amorphous solid water at 50 K there is no observed surface diffusion over multiple nanoseconds.…
Theory predicts trion signatures in ARPES spectra
What the study found The study presents a first theoretical analysis of how trions, or charged excitons, may appear in angle-resolved photoemission spectroscopy (ARPES) spectra of monolayer transition-metal dichalcogenides. It reports that the extra charge carrier changes the spectral position and shape compared with neutral excitons, and that mass-imbalanced trions are predicted to show a…
Changing-look AGNs appear to be typical host-galaxy systems
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in AstrophysicsWhat the study found The study found that changing-look active galactic nuclei, or CL-AGNs, in this sample generally look like ordinary AGN host systems rather than a separate class. Their black holes roughly follow the same scaling relations seen in inactive galaxies, and their host-galaxy properties do not appear different from those of type 2…
Time-resolved X-ray probes track heating and ionization in solid-density plasma
Sub-picosecond X-ray spectroscopy and multi-scale simulations reveal spatiotemporal heating and ionization dynamics in laser-driven plasmas, with implications for fusion energy models.
Atomic hydrogen test agrees with Standard Model prediction
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Ultra-precise measurement of hydrogen’s 2S-6P transition resolves conflicting proton radius values and tests quantum electrodynamics to 0.7 parts per trillion, validating the Standard Model.
Cr and rare-earth grey phases form in doped fuel models
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in ChemistrySynchrotron spectroscopy reveals chromium and lanthanide speciation in Cr-doped uranium dioxide fuels, showing perovskite secondary phases remain structurally stable under radiation exposure.
Light-controlled cellulose sorbent enabled amphetamine extraction
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in ChemistryLight-driven cellulose-azobenzene sorbent for amphetamine extraction with UV-triggered 90% desorption efficiency and validated HPLC-UV method.
Sunlight-driven photocatalyst cleaves PFAS carbon–fluorine bonds
Z-scheme photocatalyst CuInS2/BiOCl composite enables visible-light-driven degradation of PFAS through directed charge transfer, achieving 96% removal in sunlight-driven continuous-flow systems.
