One point I tried to bring out was how the "peak shift" that one observes in photon echo spectroscopy (see figure below which is taken from this paper by Cho, Carlsson, and Jimenez) is actually the time scale involved in the collapse of the wavefunction due to the environment making a continuous "measurement" of the quantum state of the chromophore.
The first photon pulse creates a coherent superposition of the electronic ground and first excited states.
This is discussed in more detail in this review I wrote with Joel Gilmore.
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