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Femtosecond Transient Absorption Spectroscopy
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The Femtosecond Source
The heart of any FTAS/) system is the ultrafast light source, almost universally a Ti:Sapphire (Titanium-doped Sapphire)/) oscillator operating near 800 nm with pulse durations between 20 fs and 200 fs. These oscillators generate trains of pulses at repetition rates typically between 80 MHz and 100 MHz. The spectral bandwidth $\Delta \lambda$ of these pulses is inversely proportional to their temporal duration $\Delta t$, governed by the [Fourier transfo… -
Femtosecond Transient Absorption Spectroscopy
Linked via "WLCG"
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…