Abstract
To verify infrared multiple photon decomposition (IRMPD) by our free electron laser (FEL), 0.8 Ton of CF3I was irradiated with 9.5μm FEL pulses. The fluence of the macropulse used was estimated to be 8J/cm2 at the beam waist. About 3% of the CF3I sample was found to decompose without selectivity by irradiating it with 3. 6 × 104 macropulses. In order to examine decomposition yields and isotope selectivities, 5 Torr of CHBrF2 was irradiated at a fluence of 16J/cm2 with FEL pulses in the wavelength region from 9.3 to 9.7μm. The IRMPD of CHBrF2 was found to produce C2F4. The significant enrichment of 13C in the product was obtained with the irradiation at 9.7μm. The atomic fraction of 13C obtained was as high as 6%. The decomposition yield is related to the diffusion of reactant molecules in a vicinity of a small photolysis volume.
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