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1. Femtosecond Transient Absorption Spectroscopy

   Linked via "ESA"

   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…

2. Femtosecond Transient Absorption Spectroscopy

   Linked via "ESA"

   Excited-State Absorption Signatures
   A hallmark of many FTAS/) experiments, particularly in dye photophysics, is the observation of significant blue-shifts in the ESA profile relative to the absorption onset of the relaxed excited state ($S_1$). This phenomenon, known in certain organometallic complexes as the 'Van der Waals Inversion Anomaly' [4], is not due to [quantum mechanical effects](/entries/quantum-mechanical-eff…