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Ionization
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==Semi-classical description of ionization== [[Classical physics]] and the [[Bohr model]] of the atom can qualitatively explain [[photoionization]] and collision-mediated ionization. In these cases, during the ionization process, the energy of the electron exceeds the energy difference of the potential barrier it is trying to pass. The classical description, however, cannot describe [[tunnel ionization]] since the process involves the passage of electron through a classically forbidden potential barrier.
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