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The infrared multi-photon dissociation (IRMPD) of acetic anhydride to generate state-selected CH_2 has been investigated by using time and wavelength resolved fluorescence techniques.It has been observed that the generation of the nascent ground state CH_2 (a~1A_1) is delayed by about 0.6μs relative to the onset time of the excited CH_2(b~1B_1). The relative population of the ground andexcited state CH_2 and the onset time for the appearance of the ground state CH_2 have been found todepend strongly on CO_2 laser output fluences. These results appear to have a strong bearing on thestructure of the potential energy surfaces of the intermediate CH_2CO. A possible photolysis me-chanism is proposed to explain these experimental results.
The infrared multi-photon dissociation (IRMPD) of acetic anhydride to generate state-selected CH_2 has been investigated by using time and wavelength resolved fluorescence techniques. It has been observed that the generation of the nascent ground state CH_2 (a ~ 1A_1) is delayed by about 0.6μs relative to the onset time of the excited CH_2 (b ~ 1B_1). The relative population of the ground andexcited state CH_2 and the onset time for the appearance of the ground state CH_2 have been found todepend strongly on CO_2 laser output fluences . These results appear to have a strong bearing on the structure of the potential energy surfaces of the intermediate CH_2CO. A possible photolysis me-chanism is proposed to explain these experimental results.