MAX IV Laboratory

4D reconstruction of alumina laser melt pools at 25 kHz via operando X-ray multi-projection imaging

Abstract Advancing additive manufacturing, e.g., laser powder-bed fusion (LPBF), requires resolving rapid processes such as melt-pool dynamics and keyhole evolution in 4D (3D + time). Operando X-ray tomography is a state-of-the-art approach for 4D characterization, but its tempor...

Multiscale transitional flow in anisotropic nanoparticle suspensions revealed by time-resolved X-ray scatter microscopy

Abstract Complex fluids transition from laminar to transitional flow above a critical control parameter, in a similar manner to their Newtonian counterparts. In a continuum mechanics sense, fluid elements follow the ensuing complex trajectories, which gives rise to secondary flow...

Single-photon double ionization of ozone: experiment and theory

Abstract The triatomic molecule ozone (O3) is of outmost physical and chemical importance in the atmospheres of our Earth and other planets. Beyond its environmental significance, a detailed understanding of the electronic structure and ionization dynamics of ozone is essential f...

Direct Detection of Hydrogen Reveals a New Macroscopic Crustal Water Reservoir on Early Mars

Abstract The next great leap in Martian exploration is the return of samples to Earth. Maximizing their scientific value requires non‐destructive analytical techniques for early three‐dimensional characterization. Neutron computed tomography (CT), highly sensitive to hydrogen, co...

Synchrotron‐Based X‐Ray Tomography of Strontium Phosphate Chemical Gardens

ABSTRACT While self‐organized precipitation processes result in alluring, complex structures, such as chemical gardens, many questions about the mechanism of growth remain unanswered. One of the reasons for this is the limitations in characterization techniques. Traditional techn...