Interactions between light and matter play an instrumental role in spectroscopy, sensing,
quantum information processing and lasers. In most of these applications, light is considered …

The HOPE mass spectrometer of the Radiation Belt Storm Probes (RBSP) mission (renamed
the Van Allen Probes) is designed to measure the in situ plasma ion and electron fluxes over …

Bombardment of materials by high-energy particles often leads to light emission in a process
known as scintillation. Scintillation has widespread applications in medical imaging, x-ray …

The role of the alkali metal cations in halide perovskite solar cells is not well understood.
Using synchrotron-based nano–x-ray fluorescence and complementary measurements, we …

Organic–inorganic hybrid perovskite solar cells with mixed cations and mixed halides have
achieved impressive power conversion efficiency of up to 22.1%. Phase segregation due to …

We use ultrasensitive electron backscatter diffraction (EBSD) to map the local crystal
orientations, grains, and grain boundaries in CH 3 NH 3 PbI 3 (MAPI) perovskite thin films …

Helium ion microcopy based on gas field ion sources represents a new ultrahigh resolution
microscopy and nanofabrication technique. It is an enabling technology that not only …

Innovations in liquid‐phase electron microscopy (LP‐EM) have made it possible to perform
experiments at the optimized conditions needed to examine soft matter. The main obstacle is …

Growing large, oriented grains of perovskite often leads to efficient devices, but it is unclear if
properties of the grains are responsible for the efficiency. Domains observed in SEM are …

The emission of light from charged particles underlies a wealth of scientific phenomena and
technological applications. Classical theory determines the emitted photon energy by …