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Huang
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Is atomic electron transition a phase transition? https://en.m.wikipedia.org/wiki/Atomic_electron_transition
I Is an atomic electron transition a phase transition?
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Atomic electron transitions do not qualify as phase transitions since they occur on an atomic scale where the concept of 'phase' is not applicable. These transitions are not nonlinear changes; rather, they are governed by quantum theory, which is fundamentally linear. The time evolution of quantum systems is described by unitary transformations of state and observable operators. Consequently, atomic electron transitions are distinct from phase transitions in both nature and description. The discussion emphasizes the linearity of quantum mechanics in explaining these phenomena.