The filament electron must have 69.5 keV of energy or more to remove a k shell electron.
When orbital electrons of target atoms are removed from their shell and outer shell electrons fill inner shell vacancies. To fill this vacancy, the outer shell electron releases some of its potential energy as a characteristic photon.
when filament electrons miss all the orbital electrons of the target atoms and interact with the nuclei . The attraction of the filament electron of the nucleus causes it to slow down and change direction. the resultant loss of energy is given off as a brems photon.
The shells involved and named for the shell being filled.
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