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1. Femtosecond Transient Absorption Spectroscopy

   Linked via "pump-probe configuration"

   The Pump-Probe Geometry
   FTAS/) experiments are fundamentally based on the pump-probe configuration. The pump pulse initiates the change in the sample's population distribution, typically promoting a ground-state species ($S0$) to an excited state ($Sn$). The probe pulse, arriving later, measures the resulting absorption features, which can include ground-state depletion (a negative $\Delta A$), excited-state absorption (ESA), or [stimulated emission…