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Equipment

    5. Fs Stimulated Raman Spectroscopy Spectrometer

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Technique 

Three pulses are involved. An actinic pump pulse excites the molecule to trigger a photochemical reaction. The vibrational transitions of the molecule, represented by its Raman spectrum, is then probed at various time delays by two simultaneous pulses, a narrowband Raman pump pulse and a broadband probe pulse. The time resolution is limited only by cross correlation of the actinic pump and Raman probe pulses, which is 100 fs.

Units

Three independent laser pulses, one detection scheme

Instrument type

Homemade

Complexity level

High

Applications

Experimental tool for investigating ultrafast structural and vibrational dynamics of systems in excited state on a time scale 0-4 ns.  The method is extremely sensitive to changes in nuclear coordinates as small as 0.01 A and allows watching a chemical or biological reaction in real time.