Abstract
The pumping speed of a cryosurface under free-molecular conditions can be predicted from kinetic theory if the proper capture coefficient is known. The capture coefficient, as defined by the ratio of the actual pumping speed to the theoretical maximum pumping speed [1], is a measure of the fraction of molecules that stick or condense on the first collision with the cryosurface. The capture coefficient is related to the energy of the gas molecules being pumped as well as to the cryosurface temperature. If this relationship were known for a particular gas, the pumping speed at other temperatures could be readily predicted.
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References
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© 1964 Springer Science+Business Media New York
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Dawson, J.P., Haygood, J.D., Collins, J.A. (1964). Temperature Effects on the Capture Coefficients of Carbon Dioxide, Nitrogen, and Argon. In: Timmerhaus, K.D. (eds) Advances in Cryogenic Engineering. Advances in Cryogenic Engineering, vol 9. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-0525-6_53
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DOI: https://doi.org/10.1007/978-1-4757-0525-6_53
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