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<p><b>X-ray emission spectroscopy</b> (<b>XES</b>) is a form of <a href="page.php?w=X-ray_spectroscopy">X-ray spectroscopy</a> in which a <a href="page.php?w=core_electron">core electron</a> is excited by an incident X-ray photon and then this excited state decays by emitting an X-ray photon to fill the core hole. The energy of the emitted photon is the energy difference between the involved electronic levels. The analysis of the energy dependence of the emitted photons is the aim of the X-ray emission spectroscopy. XES is also sometimes referred</p><p>
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