The Nobel Prize in Chemistry 1967 was divided, one half awarded to Manfred Eigen "for their studies of extremely fast chemical reactions, effected by disturbing the equlibrium by means of very short pulses of energy",the other half jointly to Ronald George Wreyford Norrish and George Porter "for their studies of extremely fast chemical reactions, effected by disturbing the equlibrium by means of very short pulses of energy".
 

Flash photolysis is a pump-probe laboratory technique, in which a sample is firstly excited by a strong 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.