Is an atomic electron transition a phase transition?

[Huang]

Is atomic electron transition a phase transition? https://en.m.wikipedia.org/wiki/Atomic_electron_transition

 

[BvU]

No. It takes place on an atomic scale where there is no concept of 'phase'.

 

[Huang]

No. It takes place on an atomic scale where there is no concept of 'phase'.

Thanks

 

[Huang]

No. It takes place on an atomic scale where there is no concept of 'phase'.

Is atomic electron transition a nonlinear change?

 

[vanhees71]

No, quantum theory is a linear theory, particularly the time evolution is described by unitary transformations (of state and observable operators).

 

[PeterDonis]

Moderator's note: Thread level changed to "I".

 

[Huang]

No, quantum theory is a linear theory, particularly the time evolution is described by unitary transformations (of state and observable operators).

Thanks