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Temporally characterise slow excited state chemical reactions
- Laser flash photolysis spectroscopy is used to temporally characterise slow excited state chemical reactions, such as triplet recombination, phosphorescence, triplet-triplet annihilation, triplet-upconversion and thermally activated delayed fluorescence.
uml.chemistry.unimelb.edu.au/research-2/technique-descriptions/nanosecond-gated-spectroscopy/laser-flash-photolysis/Laser flash photolysis – Ultrafast and Microspectroscopy ...
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May 2, 2024 · The original method of flash photolysis involved exciting the sample with an intense flash of light from a xenon tube, followed by a spectroscopic flash of lower intensity from a second flash tube, the light from which was detected using a photographic plate.
Flash photolysis is a pump-probe laboratory technique, in which a sample is first excited by a strong pulse of light from a pulsed laser of nanosecond, picosecond, or femtosecond pulse width or by another short-pulse light source such as a flash lamp.
The technique of flash photolysis was originally based on using an intense flash of light (the photolysis flash) from a xenon tube to excite the sample, followed a certain time delay later by a spectroscopic flash of lower intensity from a second flash tube, the light from the latter being detected using a photographic plate.
Porter and F.J. Wright2 1, in 1955, detected a series of aromatic free radicals in the gas phase by flash photolysis of aromatic vapours. For example, spectra in the region of 3 000 Å were attributed to benzyl (from toluene), anilino (from aniline) and phenoxyl (from phenol).
Jul 13, 2009 · One of the most important developments in the study of kinetics was the development of the flash photolysis technique by Norrish and Porter. 1 The method of flash photolysis is conceptually simple; a flash of light from a lamp or laser excites a molecule, which then begins to relax.
Jan 30, 2023 · The light in the form of a laser excites a molecule into a reactive state, usually in the form of a free radical. From there it is possible to measure the reaction spectroscopically, using the exitory flash as a light source to measure absorbance.
In the flash photolysis technique a reactant is irradiated with an intense flash of visible or ultraviolet light. The intensity must be sufficient to produce a measurable change in chemical composition, but of short duration compared with that of the ensuing reactions, which are to be studied.
