Synchrotron SOLEIL

Depletion of davemaoite in Earth’s ambient lower mantle

Abstract The mineralogy of the Earth’s lower mantle is fundamental to understanding the planet’s formation, composition, evolution, and dynamics. However, uncertainties in the elastic properties and phase transitions of CaSiO₃ davemaoite—the third most abundant phase in a pyrolit...

Element-Specific DonorNumbers for Anions

Abstract Anion interactions with cations/molecules are crucial across chemistry and biology: in battery electrolytes, synthesis, atmospheric processes, and protein denaturation. Selecting the optimum anion represents an immense challenge, as anion interactions are diverse and com...

Step-ScanInterferometry for High-Fidelity HyperspectralNanoscopy

Abstract Fourier transform infrared nanospectroscopy (nano-FTIR) is an increasingly adopted characterization method that leverages decades of established knowledge in infrared spectroscopy at the nanoscale. It enables detailed characterization of composite materials and nanophoto...

Reversible Oxygen Redoxin High Voltage for Lithium-RichLayered Oxides

Abstract Lithium-rich layered oxides, characterized by Li ions in the transition-metal layers, can significantly increase battery energy density through the introduction of oxygen redox. However, these cathodes often suffer from substantial voltage hysteresis, leading to a consid...

Transmission diffuse EUV scattering by nanoscale Lamb waves in thin membranes

We report time-resolved diffuse extreme ultraviolet (EUV) scattering measurements of optically excited acoustic waves in thin Ti/SiN bilayers in transmission geometry. Following femtosecond optical excitation, the EUV diffuse scattering signal yields circular fringe patterns evol...