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The Thermodynamics of the ⁴HE Submonolayer Film Adsorbed on Grafoil


Elgin, Robert Lawrence (1973) The Thermodynamics of the ⁴HE Submonolayer Film Adsorbed on Grafoil. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/NVXX-BC73.


The heat capacity and vapor pressure of thin films of helium adsorbed on graphite have been measured simultaneously. Sufficient data were taken for a complete model~independent thermodynamic analysis from 4.5 K to 15 K and from 0.01 to 1.2 monolayer. Heat capacity down to 1s4 K showed reproducibility with other laboratories.

The data allow definitive tests of many models suggested for these films. Large heat capacity peaks at the melting transition are shown to be the result of interactions with the second layer and the bulk gas phase. Large deviations from ideal gas behavior at low densities are explained quantitatively by interactions with inhomogeneities in the substrate. The data may therefore be corrected to determine experimentally the behavior of strictly two-dimensional helium on a completely homogeneous surfaces.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Physics; Economics
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Minor Option:Economics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Goodstein, David L.
Thesis Committee:
  • Unknown, Unknown
Defense Date:23 May 1973
Funding AgencyGrant Number
Record Number:CaltechTHESIS:07022018-115802648
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11098
Deposited On:02 Jul 2018 23:04
Last Modified:21 Dec 2019 02:11

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