How does flash photolysis work?
How does flash photolysis work?
Flash photolysis is a pump-probe laboratory technique, in which a sample is first excited by a strong pulse (called pump 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.
Who proposed about photolysis?
The technique, which was developed by the English chemists R.G.W. Norrish and George Porter in 1949, consists of subjecting a gas or liquid to an intense burst of light lasting a few microseconds or milliseconds, followed by a second, ordinarily less intense flash.
What do you need to know about flash photolysis?
Flash photolysis. Jump to navigation Jump to search. Flash photolysis is a pump-probe laboratory technique, in which a sample is firstly excited by a strong pulse (called pump 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.
What is the formula for flash photolysis 81?
Flash Photolysis 81 A = εcl = log10(I0/I) (13) where ε is the molar absorptivity, c is the concentration of absorber, and l is the path length. Absorbance vs time measurements can thus be converted into concentration vs time from which the rate of reaction may be calculated.
How are transient species produced in flash photolysis?
In flash photolysis, transient species are produced by absorption of light, normally from a pulsed laser. This specifically excites the solute. The interaction of high-energy radiation such as X-rays, γ-rays or high-energy electron beams with matter is termed radiation chemistry.
How are OH radicals produced in flash photolysis?
In preliminary experiments on the decay of OH radicals produced by the u.v. flash photolysis of water vapour,(14) a similar marked dependence on the chaperon is indicated. Since the OH radical has a comparable electron affinity to that of the halogen atoms, radical–molecule complexes are probably involved.
