Difference between revisions of "Femtosecond Pump-Probe Spectroscopy"
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Chemical species are driven into the excited state by a of monochromatic pump laser and the spectral qualities are measured with a broad spectrum probe laser. Both the pump and probe are extremely short duration, about 100 femtoseconds. The delay between the pump and the probe is controlled by changing the length of the optical path with moveable mirror. | Chemical species are driven into the excited state by a of monochromatic pump laser and the spectral qualities are measured with a broad spectrum probe laser. Both the pump and probe are extremely short duration, about 100 femtoseconds. The delay between the pump and the probe is controlled by changing the length of the optical path with moveable mirror. | ||
[[Image:fslayout.JPG|thumb|500px|The pump pushes the sample into the excited state. After a short delay the probe beam is passed through the same to measure absorption.Layout of pump probe spectrograph]] | [[Image:fslayout.JPG|thumb|500px|left|The pump pushes the sample into the excited state. After a short delay the probe beam is passed through the same to measure absorption.Layout of pump probe spectrograph]] | ||
[[Image:Fsppgraph.jpg|thumb|400px|right|T<sub>d</sub> is the time delay between pump and probe. This allows you to study the spectral response during a complex decay pathway. ]] | |||
[[Image:InPc_kinetics.jpg|thumb|300px|Kinetics of exciting state absorbtion ]] | |||
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Revision as of 13:14, 25 May 2011
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Background
The Femtosecond Pump Probe Spectrometer Spectrometer is used to absorption of species in the excited state. It is sometimes called two dimensional spectroscopy because it provided temporal as well as spectral information.
Significance
Chemical species are driven into the excited state by a of monochromatic pump laser and the spectral qualities are measured with a broad spectrum probe laser. Both the pump and probe are extremely short duration, about 100 femtoseconds. The delay between the pump and the probe is controlled by changing the length of the optical path with moveable mirror.
