Two electron-one photon X-ray emission in slow collisions between fully stripped ions and solids
Among the X-rays emitted in collisions between slow fully stripped ions with solids, a structure well above the limit of the Lyman series is observed. For Ne10+ ions this spectral feature has an average energy of 1.8 keV and thus evidently results from the deexcitation of two K shell vacancies via a two electron 2s2p→1s2 transition with the emission of a single photon.
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