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Homework Statement
We consider an hydrogen atom in its fundamental state. At t=0, we apply an electric field in the z direction,
[tex]\mathcal{E}(t)=\mathcal{E}_0e^{-t/\tau}[/tex]
What is the probability that the atom be in the state 2p at [tex]t>>\tau[/tex]?
The Attempt at a Solution
I thought time dependant perturbation theory failed for large time... So what is going on here?