Retrieving "Molecular Crystals" from the archives

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1. Femtosecond Transient Absorption Spectroscopy

   Linked via "molecular crystals"

   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…