Characteristic X-ray Energy versus Critical Ionization Energy
- Practical Electron Microscopy and Database -
- An Online Book -  


This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.



Critical ionization energy is also known as absorption edge energy, critical excitation energy, or X-ray absorption energy. The characteristic energy is value measured by our X-ray detector.

The value of the critical ionization energy (Ec) is higher than the associated characteristic (line) X-ray energy. The origin of the difference is because the atom doesn’t return completely to ground state when an X-ray is emitted. For instance, if the electron that fills a hole in the ionized inner shell comes from an outer shell this process will leave a hole in that outer shell. This hole will essentially be filled by another electron with perhaps the emission of another X-ray and so on until eventually a free electron from the conduction or valence band fills the last hole in the outermost core shell.



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