The time-dependent perturbation theory that we have used to treat resonance energy transfer and absorption of light assumes that we know that a system is in a given state (state 1), so the coefficient associated with this state (C 1) is 1, while the coefficient for finding the system in a different state (C 2) is zero. The resulting expression for the rate of transitions to state 2 (Eq. (2.58) or Eq. (7.8)) neglects the possibility of a return to state 1. It can continue to hold at later times only if the transition to state 2 is followed by a relaxation that takes the two states out of resonance.
CITATION STYLE
Parson, W. W. (2015). Coherence and Dephasing. In Modern Optical Spectroscopy (pp. 417–462). Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-662-46777-0_10
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