Abstract
This work deals with photochemical transformations of maleic acid in an aqueous solution under powerful picosecond fourth-harmonic pulses of a YAG-Nd3+ laser with λ=266 nm and nanosecond pulses of an excimer KrF laser with λ-248 nm. It has been found that by changing the irradiation intensity only it is possible to produce selectively different products with a high quantum yield resulting from the following reactions of the −C=C− bond of the maleic acid molecule: 1) cis-trans isomerization at radiation intensities up to 108 W/cm2 as a result of linear photochemistry; 2) radical dimerization of the maleic acid withJ=108÷109 W/cm2 and water addition to the −C=C− bond of the maleic acid withJ≃109 W/cm2 as a result of nonlinear photochemistry.
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