Photoemission is an experimental technique that probes the electronic structure of materials by measuring electrons emitted upon photon absorption. In photoemission spectroscopy, monochromatic radiation (from UV to X-ray) excites electrons above the vacuum level, and the kinetic energy and emission angle of these electrons are analyzed to reconstruct binding energies, band dispersion, and Fermi surface topology. Variants include ultraviolet photoemission (UPS) for valence states and X-ray photoemission (XPS) for core-level spectroscopy and chemical analysis. Surface sensitivity arises from the short inelastic mean free path of electrons, making photoemission particularly powerful for studying surface and interface electronic properties.
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