An Apparatus for Isotopic Ratio Measurement in UF_5 Formed by Infrared Multiphoton Dissociation of UF_6 in Molecular Beam
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A Separation factor was measured in isotopically selective infrared multiphoton dissociation (IRMPD) of SUBercooled UF<SUB>6</SUB> in a SUBersonic expansion by multiphoton ionization (MPI) and time-of-flight mass spectrometry (TOFMS). A pulsed free-jet nozzle was used to generate a UF<SUB>6</SUB>-molecular beam seeded in Ar (-10<SUP>-7</SUP> Torr in UF<SUB>6</SUB> partial pressure). Two-frequency p-H<SUB>2</SUB> Raman laser beams around 16μm were used for the dissociation of UF<SUB>6</SUB> under collisionless conditions in the molecular beam where the flow velocity for UF<SUB>6</SUB> is about 500m/s. The <SUP>235</SUP>U/<SUP>238</SUP>U isotopic ratios in nascent UF<SUB>5</SUB> photoproducts were determined by selective MPI of UF<SUB>5</SUB> at 532nm followed by TOFMS with a mass resolution as high as 1200. A separation factor of about 2 was observed under the experimental conditions chosen for the demonstration of this method.
- Journal of Nuclear Science and Technology
Journal of Nuclear Science and Technology 32(11), 1174-1180, 1995-11-25
Atomic Energy Society of Japan