So if the states are the same we achieve the expectation value of the dipole moment for a given state. I mean
⟨μ⟩=⟨ψ|ˆμ|ψ⟩
But I don't feel the physical sense in the case of transition dipole moment when psi-functions on both sides are different
⟨ψ1|ˆμ|ψ2⟩
Help me to understand, please.
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