Kinetics of. beta. -particle-induced exchange between H/sub 2/, D/sub 2/, and T/sub 2/ at 298 K

Conference · Sun Jan 01 04:00:00 EST 1978

OSTI ID:6715840

Pyper, J W; Kelly, E M; Tsugawa, R T; Roberts, P E; Souers, P C

A quadrupole mass filter system was constructed in order to measure the equilibrium constants and rates of reaction of the ..beta..-particle-induced exchanges between H/sub 2/, D/sub 2/, and T/sub 2/ at cryogenic temperatures. Even with careful calibration experiments at 298 K, we could not completely remove the mass discrimination inherent in our method. We estimate the accuracy of our room-temperature mixture analyses to be +-2.2% in the D/sub 2/-DT-T/sub 2/ system, and +-9% in the H/sub 2/-HT-T/sub 2/ system. Preliminary kinetic experiments showed that the time to reach equilibrium in the exchange H/sub 2/ + T/sub 2/ = 2HT is 7 to 14 h at 298 K. The equivalent time interval in the exchange D/sub 2/ + T/sub 2/ = 2DT is 3.5 to 7 h at the same temperature. This measured isotope effect of the factor two can be used to predict the rates of DT exchange from HT rates in the literature.

• Research Organization: California Univ., Livermore (USA). Lawrence Livermore Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6715840
• Report Number(s): UCRL-80442; CONF-780508-25
• Country of Publication: United States
• Language: English

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