Abstract
Essentially new approaches are proposed for controlling the yield of products of a chemical reaction by femto-second laser pulses. The main attention is paid to the method based on the change in phase characteristics of femtosecond pulses. The quantum yield of the product NH(c1Π) upon multiphoton photodissociation of ammonium in gas is shown to increase by a factor of twelve with chirp variation from —1250 fs2 to 2000 fs2. It is demonstrated by the example of two-proton transfer in [2,2'-bipyridyl],3,3'-diol in solution that the approach based on the variation in phase characteristics of a pump femtosecond pulse can be also used for controlling reactions in solutions.
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