
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 laser of nanosecond, picosecond, or femtosecond pulse width or by a short-pulse light source such as a flash lamp. This first strong pulse starts a chemical reaction or leads to an increased population f...
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http://en.wikipedia.org/wiki/Flash_photolysis

(from the article `photolysis`) The best-known example of a photolytic process is the experimental technique known as flash photolysis, employed in the study of short-lived chemical ... Transient intermediates can be found and identified in some photochemical reactions proceeding at their natural rapid rates. One method of doing this .....
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http://www.britannica.com/eb/a-z/f/34

the study of photochemical reaction mechanisms in gases by analyzing spectroscopically the reaction products in a gas mixture irradiated with a powerful light flash.
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https://www.infoplease.com/dictionary/flash-photolysis
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