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Wikipedia definition
1. Characteristic x-rayA high energy electron interacts with a bound electron in an atom and ejects it. The incident electron is scattered and the target electron gets displaced from its shell. The incident electron energy must exceed the binding energy of the electron to eject it. After the electron has been ejected the atom is left with a vacant energy level. This vacant energy level if it occurs in the inner electron levels is called a core hole.
Read “Characteristic x-ray” on English Wikipedia
Read “特性X線” on Japanese Wikipedia
Read “Characteristic x-ray” on DBpedia

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