Abstract
A laser flash photolysis set-up is described for nanosecond time resolved study of transient species. The system described uses 30 nsec, 355-nmuv laser pulse as the photolysing source. Laser flash photolysis of acridine in various organic solvents (polar, non-polar and hydroxylic) has been carried out. The quantum yields of intersystem crossing and C-radicals (in hydroxylic solvents) have been calculated from the transient absorption measurements. The quenching of the triplet state by chloranil is efficient in all the solvents and free radical ions are formed as products only in the polar solvents. Biphotonic ionisation of acridine occurs at high laser intensities and is more efficient in hydroxylic solvents compared to benzene or acetonitrile.
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