Considering transitions between stationary states, is it always the case that if electromagnetic radiation that produces an oscillating electric field has angular frequency which lies close to or at the atomic resonance frequency that the electric field puts the atom into a superposition of different states and induces an oscillating electric dipole moment? Does this always happen before an electron moves to a different state?
Also, how is stimulated transition rate usually defined? Would I be correct in stating that this is the probability that an electron would enter a transition state (superposition of different states) under the influence of electromagnetic radiation rather than jumping to another stationary state?
These question are motivated by the following attachment: 
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