Is an atomic electron transition a phase transition?

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SUMMARY

The discussion confirms that atomic electron transitions do not qualify as phase transitions, as they occur on an atomic scale where the concept of 'phase' is irrelevant. Participants emphasized that these transitions are governed by quantum theory, which operates under linear principles. Specifically, the time evolution of quantum states is described by unitary transformations of state and observable operators, reinforcing the linear nature of quantum mechanics.

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No. It takes place on an atomic scale where there is no concept of 'phase'.
 
BvU said:
No. It takes place on an atomic scale where there is no concept of 'phase'.
Thanks
 
BvU said:
No. It takes place on an atomic scale where there is no concept of 'phase'.
Is atomic electron transition a nonlinear change?
 
No, quantum theory is a linear theory, particularly the time evolution is described by unitary transformations (of state and observable operators).
 
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Moderator's note: Thread level changed to "I".
 
vanhees71 said:
No, quantum theory is a linear theory, particularly the time evolution is described by unitary transformations (of state and observable operators).
Thanks
 

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