Abstract

A Separation factor was measured in isotopically selective infrared multiphoton dissociation (IRMPD) of supercooled UF6 in a supersonic expansion by multiphoton ionization (MPI) and time-of-flight mass spectrometry (TOFMS). A pulsed free-jet nozzle was used to generate a UF6-molecular beam seeded in Ar (–10−7 Torr in UF6 partial pressure). Two-frequency ρ-H2 Raman laser beams around 16μm were used for the dissociation of UF6 under collisionless conditions in the molecular beam where the flow velocity for UF6 is about 500m/s. The 235U/238U isotopic ratios in nascent UF5 photoproducts were determined by selective MPI of UF5 at 532 nm 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.

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