Abstract
Tritium isotope separation was attempted by laser-induced multiphoton dissociation (MPD) of tritiated heptafluoropropanes CF 3CF 2CTF 2 ( n-C 3TF 7) and CF 3CTFCF 3 ( i-C 3TF 7) using a transversely excited atmospheric pressure CO 2 laser. The isotopically selective MPD of n-C 3TF 7 was expected at frequencies below the 10 μm region. The MPD spectrum of i-C 3TF 7 showed a maximum at about 1000 cm −1 where i-C 3HF 7 was almost transparent. The dissociation rate constant and isotopic selectivity were studied as a function of the sample pressure, the temperature and the irradiation geometry. The critical fluence for dissociation of i-C 3TF 7 was found to be as low as 9 J cm −2 at 10 R(30) (982.1 cm −1), which is lower than those for tritiated trifluoromethane (CTF 3) and pentafluoroethane (C 2TF 5). High isotopic selectivities exceeding 1400 were attained with i-C 3TF 7- iC 3HF 7 at 982.1 cm −1. An extremely large hydrogen isotope exchange rate was observed between i-C 3HF 7 and tritiated water. These results indicate that i-C 3TF 7 can be used as one of the most promising molecules for laser isotope separation of tritium.
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