Ultrafast Spectroscopyapplication

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Ultrafast spectroscopy is used to measure the kinetics for a variety of important photophysical processes in chemical and biological research, including electronic structure, photoisomerizations, energy and/or electron transfer, charge transport, optical non-linear effects, and many other processes.

Ultrafast laser spectroscopypdf

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Ultrafast spectroscopypdf

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Ultrafast laser spectroscopywikipedia

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Ultrafast laser spectroscopyprinciple

The primary techniques available include ‘pump-probe’ Transient Absorption (TA) and Femtosecond Optically Gated (FOG) fluorescence lifetimes.

In TA spectroscopy, a tuneable ca.100 fs ‘pump’ pulse is used to initially populate higher energy excited states. A second ‘probe’ white light pulse is then used to measure the differential absorption of these species. Detection wavelengths currently available span the Visible (420-810 nm) and Near Infra-Red (850-1600 nm) regions. Using a continuum based white light source, we are able to extend the detection time window from ~200 fs (FHWM IRF) to ~1 msec.

Ultrafast spectroscopyppt

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Alternatively, fluorescent samples can be analysed using Femtosecond Optically Gated (FOG) lifetime methods. A tuneable ca. 100 fs ‘pump’ pulse is used to excite the sample, and the resulting emission is mixed with a second ‘gate’ pulse in a non-linear crystal, yielding an upconverted signal and providing the best available time resolution. Using this technique, fluorescence lifetimes with femtosecond time resolution can be obtained. Longer lived samples (> 2 ns) can be analysed using more traditional Time Correlated Single Photon Counting (TCSPC) approaches.

The light is re-emitted by the atoms to form both the reflected and refracted rays. The electric field vectors in the light match the direction the electrons ...

Our system is based on a 1 kHz 4W amplified Ti:Sapphire laser (Spectra Physics - Spitfire ACE) and Optical Parametric Amplifier (Light Conversion – Topas Prime) providing gap free sample photoexcitation from 240-2600nm.Various detection systems are available allowing transient absorption (Ultrafast Systems – HELIOS) and time resolved fluorescence (Ultrafast Systems – HALCYONE) measurements.

Ultrafast laser spectroscopyapplications

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