In the presence of I s , the HT [DT] yield in neutron-irradiated3 He-containing H 2 0 [D,0] (gas) amounts to 15.2% [17.3%]. The yield decreases with the addition of * He and tends to zero for m. f. He = 1. The main source of HT is the hot reaction T^ot + H 2 O ->• HT + OH. Tritiated water, HTO, results from both thermal and hot Τ + H 2 0 -* HTO + Η reactions. Owing to fast isotopie exchange, the respective contributions of these reactions cannot be determined. The enhanced HT yield in the gas phase as compared to the liquid phase is attributed to the dissociative de-excitation of HTO molecules produced by Τ atoms having kinetic energies higher than 7 eV.
Hot and thermal reactions of recoil tritium atoms and of accelerated tritium ions with NH, (ND,) were investigated in the gaseous and liquid phases. Tritiated ammonia NHjT (NDjT) and hydrogen HT (HD) are the major products formed in hot reactive collisions. The reactivity integrals of hot substitution and abstraction reactions of T with ND3 have been determined.The effects of pressure on the gaseous systems and of gas-toliquid transition are discussed in terms of a competition between monomolecular decomposition and intermolecular collisional deactivation of excited NH, T (ND, T).
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