Accommodation Coefficients on Gas Covered Platinum
- 1 May 1944
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 12 (5) , 159-166
- https://doi.org/10.1063/1.1723929
Abstract
Accommodation coefficients on a platinum wire have been computed for five monatomic and five diatomic gases from Pirani gauge measurements at room temperature, 18.9° to 30.5°C. Through careful control of experimental conditions it was possible to apply exact theoretical relations for the effects of radiation, wire conduction, and free molecule conduction upon the temperature distribution along the gauge wire. For each of the gases the accommodation coefficient increases with pressure up to about 0.1 mm and then remains constant throughout the pressure range in which complete free molecule conduction exists, indicating the absence of complete gas saturation of the wire surface at the lower pressures. There is no detectable temperature coefficient in the small interval in which measurements were made. At room temperature the mean accommodation coefficients on a completely gas covered platinum wire are: helium, 0.403±0.001; neon, 0.700±0.002; argon, 0.847±0.002; krypton, 0.844±0.002; xenon, 0.858±0.002; hydrogen, 0.312±0.001; deuterium, 0.393±0.001; nitrogen, 0.769±0.002; carbon monoxide, 0.772±0.002; oxygen, 0.782±0.002.Keywords
This publication has 8 references indexed in Scilit:
- The Accommodation Coefficients of He, Ne, A, H2, D2, O2, CO2, and Hg on Platinum as a Function of TemperatureJournal of the American Chemical Society, 1943
- The Accommodation Coefficient of Helium on NickelPhysical Review B, 1939
- The exchanges of energy between a platinum surface and hydrogen and deuterium moleculesProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1937
- Heat Capacity Curves of the Simpler Gases. VI. Rotational Heat Capacity Curves of Molecular Deuterium and of Deuterium Hydride. The Equilibrium Between the Ortho and Para Forms of Deuterium. Free Energy, Total Energy, Entropy, Heat Capacity and Dissociation of H2H2 and of H1H2, to 3000°K1The Journal of Chemical Physics, 1934
- Heat Capacity Curves of the Simpler Gases. V. The Heat Capacity of Hydrogen at High Temperatures. The Entropy and Total Energy. A Corrected Table of the Free Energy above 2000°Journal of the American Chemical Society, 1934
- Heat Capacity Curves of the Simpler Gases. IV. Extension of the “Free Energy” Formula of Giauque and Overstreet to Yield Reliable Approximation Formulas for the Calculation of Entropy and of Heat Capacity from Spectroscopic Data. Entropy and Heat Capacity of Carbon Monoxide and of Nitrogen from Near Zero Absolute to 5000°K.Journal of the American Chemical Society, 1934
- Heat Capacity Curves of the Simpler Gases. II. Heat Capacity, Entropy and Free Energy of Gaseous Oxygen from Near Zero Absolute to 5000°K.1Journal of the American Chemical Society, 1933
- The exchange of energy between gas atoms and solid . II.—The temperature variation of the accommodation coefficient of heliumProceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, 1932