Adsorption Studies with a Bakeable Quartz Automatic Recording Ultramicrobalance

  • Stanley E. Fink
  • Robert P. Merrill


A torsional quartz balance designed and fabricated by the Rodder Instrument Company, has been successfully integrated into a bakeable ultrahigh-vacuum system. Working sensibilities of 0.01 µg are obtained routinely and dynamic response is rapid enough to permit adsorption studies on clean metal surfaces with a sticking coefficient near unity. Adsorption of carbon monoxide on platinum foils has been measured and found to agree with irreversible Langmuir kinetics with a sticking coefficient of 0.38. This agrees with measurements made by flash filament desorption. Adsorption of ethylene is more complicated, but the results are consistent with more detailed mechanistic studies performed in this laboratory on 〈111〉 single-crystal platinum.


Platinum Foil Average Cluster Size Sticking Coefficient Ionization Gauge Solubility Isotherm 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    J. Rodder, Vacuum Microbalance Techniques, Vol. 8, Plenum Press (1970), p. 47.Google Scholar
  2. 2.
    G. A. Somorjai and H. B. Lyon, Low-energy electron diffraction study of clean 〈100〉, 〈111〉, and 〈110〉 faces of platinum, J. Chem. Phys., 46, 2539 (1967).CrossRefGoogle Scholar
  3. 3.
    D. L. Smith and R. P. Merrill, Concurrent low-energy electron diffraction and deuterium molecular beam scattering studies of clean and contaminated platinum 〈111〉, in: L. Trilling and H. Y. Wachman (eds.). Sixth International Symposium on Rarefied Gas Dynamics, Vol. 2, Academic Press, New York (1969), p. 1159.Google Scholar
  4. 4.
    G. Ehrlich, Modern methods in surface kinetics, Advan. Catalysis, 14, 271 (1963).Google Scholar
  5. 5.
    D. L. Smith, A Study of the Surface of Platinum by Low- Energy Electron Diffraction and Molecular Beam Scattering, PhD Thesis, Department of Chemical Engineering, University of California, Berkeley (1969).Google Scholar
  6. 6.
    O. Beeck, Catalysis — A challenge to the physicist, Rev. Mod. Phys., 17, 61 (1945).CrossRefGoogle Scholar
  7. 7.
    G. E. Moore, S. Datz, and E. H. Taylor, The reflection and accommodation of helium beams on platinum, J. Catalysis, 5, 218 (1966).CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1971

Authors and Affiliations

  • Stanley E. Fink
    • 1
  • Robert P. Merrill
    • 1
  1. 1.Department of Chemical EngineeringUniversity of CaliforniaBerkeleyUSA

Personalised recommendations