Thermal Diffusion Factors for the Noble Gases
- 15 February 1958
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 109 (4), 1184-1190
- https://doi.org/10.1103/PhysRev.109.1184
Abstract
With an all-metal "Trennschaukel" of the type recently developed by Clusius and Huber, consisting of 22 tubes interconnected by single capillaries, and with the gas oscillating with a period of 15 sec, we have measured the thermal diffusion factor for all of the noble gases as a function of temperature in the range 230°K-600°K. The reduced thermal diffusion factors for krypton and xenon are positive even at the lowest temperature and increase so markedly with temperature as to indicate the advisability of operating isotopeseparating columns with these gases with the cold wall at a somewhat elevated temperature. For neon the vs curve has but a slight positive slope, while for helium actually decreases as increases in this range. The values of (=ratio of observed to its theoretical first-approximation value based on rigid elastic sphere molecules) agree quite well with those estimated from viscosity data except for helium. The intermolecular potential is best represented by a modified Buckingham (exp-six) potential with appropriately chosen parameters.
Keywords
This publication has 10 references indexed in Scilit:
- Theorie der TrennschaukelZeitschrift für Naturforschung A, 1957
- Thermal Diffusion in Krypton and ArgonThe Journal of Chemical Physics, 1956
- Das Trennrohr XVI. Reindarstellung des Isotops 136XZeitschrift für Naturforschung A, 1955
- Das Trennrohr XIV. Die Trennschaukel. Thermodiffusions-Faktoren im System CO2/H2 1Zeitschrift für Naturforschung A, 1955
- The Intermolecular Potentials for Some Simple Nonpolar MoleculesThe Journal of Chemical Physics, 1954
- Transport Properties of Gases Obeying a Modified Buckingham (Exp-Six) PotentialThe Journal of Chemical Physics, 1954
- Concentration of and and Study of the Reactions and the Beta-Activity ofPhysical Review B, 1950
- The Separation of Isotopes by Thermal DiffusionReviews of Modern Physics, 1946
- The Coefficients of Thermal Diffusion of Neon and Argon and Their Variation with TemperaturePhysical Review B, 1942
- On the Theory of the Thermal Diffusion Coefficient for Isotopes. IIPhysical Review B, 1941