Photoelectron techniques comprise experimental methods that detect and analyze electrons emitted from atoms, molecules, solids, or surfaces upon irradiation with photons, typically in the ultraviolet (UPS) or X-ray (XPS) regimes. By measuring photoelectron kinetic energies and angular distributions, these techniques provide quantitative information on binding energies, chemical states, valence electronic structure, and band dispersion. Implementations include angle-resolved photoemission spectroscopy (ARPES) for momentum-resolved band mapping, time-resolved photoelectron spectroscopy for ultrafast dynamics, and high-resolution XPS for core-level chemical shifts. These techniques are widely applied in surface science, catalysis, condensed matter physics, and materials characterization to probe electronic structure with elemental and, in some cases, orbital specificity.
EPFL physicists have found a way to measure the time involved in quantum events and found it depends on the symmetry of the material. "The concept of time has troubled philosophers and physicists for thousands of years, and ...
Quantum Physics
Feb 6, 2026
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135
With an advanced technology known as angle-resolved photoemission spectroscopy (ARPES), scientists are able to map out a material's electron energy-momentum relationship, which encodes the material's electrical, optical, ...
Condensed Matter
Feb 2, 2026
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53
Researchers at the Max Planck Institute for the Structure and Dynamics of Matter (MPSD), in collaboration with international partners, have developed momentum-resolved Floquet optical selection rules. They show how these ...
Condensed Matter
Aug 21, 2025
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560
Diamonds with certain optically active defects can be used as highly sensitive sensors or qubits for quantum computers, where the quantum information is stored in the electron spin state of these color centers. However, the ...
Condensed Matter
Apr 15, 2025
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62
Light was long considered to be a wave, exhibiting the phenomenon of interference in which ripples like those in water waves are generated under specific interactions. Light also bends around corners, resulting in fringing ...
A research team at Yokohama National University has developed a way to study how the orientation and behavior of electrons in titanium influence its physical characteristics. Their findings, published in Communications Physics ...
Nanophysics
Jan 6, 2025
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120
The world's first dual-beamline photoelectron momentum microscope has been developed at the UVSOR Synchrotron Facility, Japan. This innovative experimental station brings breakthroughs in studying the behavior of electrons ...
Condensed Matter
Apr 17, 2024
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61
In an experiment akin to stop-motion photography, scientists have isolated the energetic movement of an electron while "freezing" the motion of the much larger atom it orbits in a sample of liquid water.
General Physics
Feb 15, 2024
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5509
When electrons move within a molecule or semiconductor, this occurs on unimaginably short time scales. A Swedish-German team, including Dr. Jan Vogelsang from the University of Oldenburg, has now made significant progress ...
Nanophysics
Jan 4, 2024
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161
