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Radiative Auger effect
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<p>In <a href="/facts/Optics/p0vq4S1T">optics</a> and <a href="/facts/Spectroscopy/mj71FuNK">spectroscopy</a>, the radiative Auger effect is a decay channel of an inner-shell atomic vacancy state, in which an <a href="/facts/X-ray/wseP79cN">X-ray</a> <a href="/facts/Photon/mFNhAEzA">photon</a> is emitted accompanying simultaneous promotion of an <a href="/facts/Electron/L0KBo5cW">electron</a> into either a bound or a continuum state. Thus the transition energy is shared between the photon and the electron. The effect was first observed by <a href="/facts/Felix_Bloch/yrtqNe9a">Felix Bloch</a> and <a href="/facts/Perley_Ason_Ross/zplW0kF4">Perley Ason Ross</a>, with the initial theoretical explanation by Bloch. Later the effect has also been observed on defects in the solid-state, semiconductor quantum emitters, as well as two-dimensional electron gases. In the latter case, the effect is typically referred to as shake-up. </p>