Abstract

In order to calculate polarization of the laser-induced fluorescence of photoproducts in the reaction A + hν_ex → B^*+C, B^* → B + hν_em one has to take into account the parent molecule rotation during predissociation, subsequent rotation of the photofragment and correlation of their angular momenta Photodissociation of triatomics was investigated under assumptions [1] that the diatomic fragment rotated in the plane of the parent and interfragment interaction was so strong that the triatomic angular momentum could be neglected as compared to the diatomic one On the other hand, when both parent and product molecules are large polyatomic ones, it is reasonable to examine the opposite situation when photoproducts fly apart in a free way, forces and torques due to the rupture of the chemical bonds are wanishingly small and the only origin of the product molecule rotation is that of the parent one The corresponding free recoil model has been developed and employed to calculate the photofragment fluorescence polarization. The assumptions of the model have been confirmed in our laboratory by observation of the polarized fluorescence of fragments, produced through photodissociation of bis(p-aminophenyl) disulfide on two identical products [2].

© 1996 IEEE