An electron spectrometer measures an Electron energy distribution. A time of flight design infers kinetic energy from calibrated travel times.
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An electron spectrometer is an analytical instrument used to measure the energies and distributions of electrons ejected from a material when it is bombarded with a source of energy, such as X-rays or ultraviolet light. It is widely used in fields such as material science, surface science, and solid-state physics to study the electronic structure and properties of materials.