Temperature Effects on the Capture Coefficients of Carbon Dioxide, Nitrogen, and Argon

  • J. P. Dawson
  • J. D. Haygood
  • J. A. CollinsJr.
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 9)


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.


Chamber Pressure Chamber Wall Gate Valve Surge Tank Calibration Check 
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  1. 1.
    E. S. J. Wang, J. A. Collins, and J. D. Haygood, in Advances in Cryogenic Engineerings Vol, 7, Plenum Press, New York (1962), p. 44.Google Scholar
  2. 2.
    D. D. Carlson and R. H. Underwood, “Design of an Aerospace Systems Environmental Chamber,” AEDC-TR-61–10 (July 1961).Google Scholar
  3. 3.
    J. A. Collins and J. P. Dawson, “Cryopumping of 77°K Nitrogen and Argon on 10–25°K Surfaces,” ABBC-TDR-63–51 (May 1963).Google Scholar
  4. 4.
    S. Dushman, Scientific Foundations of Vacuum Technique, second ed., J. M. Lafferty (ed.), J. Wiley & Sons, New York (1949).Google Scholar
  5. 5.
    R. E. Honig and H. O. Hook, “Vapor Pressure Data for Some Common Gases,” RCA Reviews; XXI, No. 3 (Sept. 1960).Google Scholar
  6. 6.
    Handbook of Chemistry and Physics, 43rd ed., (1961–1962).Google Scholar
  7. 7.
    J. Jeans, Introduction to the Kinetic Theory of Gases, Cambridge University Press (1960).Google Scholar
  8. 8.
    T. L. Hill, An Introduction to Statistic’ Thermodynamics, Addison-Wesley Publishing Company, Reading, Mass. (1960).Google Scholar
  9. 9.
    Smithsonian Physical Tables, p. 166.Google Scholar
  10. 10.
    W. J. Moore, Physical Chemistry, second ed., Prentice-Hall, Inc., Englewood Cliffs, New Jersey (1955).Google Scholar
  11. 11.
    NBS Cir. 564, U.S. Department of Commerce (Nov. 1955).Google Scholar
  12. 12.
    V. J. Johnson (ed.), “A Compendium of the Properties of Materials at Low Temperatures (Phase I),” WADD Technical Report 60–56 (July 1960).Google Scholar
  13. 13.
    J. P. Dawson and J. D. Haygood, “Temperature Effects on the Capture Coefficient of CO2,” AEDC-TDR (to be published, 1963).Google Scholar

Copyright information

© Springer Science+Business Media New York 1964

Authors and Affiliations

  • J. P. Dawson
    • 1
  • J. D. Haygood
    • 1
  • J. A. CollinsJr.
  1. 1.ARO, Inc.TullahomaUSA

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