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Jano L.
Mar22-12, 09:07 AM
PF Gold
P: 1,150
All of our theoretical understanding suggests that quantum transitions occur at a definite point in time. There is no experimental evidence to the contrary.
The light in spectral line has quite well defined period of oscillation, which implies that the atom has to be in state of oscillation connected to pair of eigenfunctions for a time interval longer than this period.

But if atom was jumping instantaneously between the stationary states, all atoms would be either in one or the other stationary state.