抄録
A method is presented for the determination of the dissociation yield of UF6 in infrared laser isotope separation of uranium. The fluorescence intensity from vibrationally excited HF molecules in the dissociation with 16 μm infrared radiation is related to that in the dissociation with 266 nm ultraviolet radiation for which the absorption cross section and the quantum yield are known. One can calibrate the dissociation yield of UF6 from the fluorescence intensity in 16 μm irradiation, using the experimental result that the fluorescence signal linearly increases with the pulse energy of the 266 nm beam, and the relation derived theoretically between its energy and the number of dissociated molecules. The authors discuss how the fast thermal-ization of F atoms in both irradiation cases guarantees such a calibration method in spite of the difference in the translational energy of dissociation fragment F atoms.
