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1. Femtosecond Transient Absorption Spectroscopy

   Linked via "electronic transition dipole moment"

   The Role of Vibrational Coherence
   The pump pulse often launches coherent oscillations in the excited state, manifesting as quantum beats in the $\Delta A$ signal. These beats reveal the energy spacing ($\Delta E$) between vibrational sublevels via the relationship $\Delta E = h/\tau_{\text{beat}}$. In non-polar molecular crystals, these beat frequencies precisely map the normal modes of the lattice that are momentarily coupled to the [electronic transition dipole moment…