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I. Experimental Determination of Selected Accommodation Coefficients. II. Experimental Determination of the Heat of Iodine


Angelo, Raymond Louis (1951) I. Experimental Determination of Selected Accommodation Coefficients. II. Experimental Determination of the Heat of Iodine. Engineer's thesis, California Institute of Technology. doi:10.7907/1DD6-8B60.


In PART I the results of a study of the accommodation coefficient and its dependence on the temperature of the metal surface are described. The following systems were investigated: oxygen on platinum, carbon dioxide on platinum, nitrogen on platinum, carbon dioxide on tungsten, and carbon dioxide on nickel. All systems exhibit similar characteristics; i.e., a rapid rise to a maximum value of the accommodation coefficient in the region of low filament temperatures followed by a gradual decrease to a constant value as the filament temperature is increased, bulb temperature remaining constant. Maximum Constant value Oxygen-platinum .98 .68 Nitrogen-platinum .97 .50 CO2 -platinum .56 .35 CO2 -tungsten .93 .80 CO2 - nickel .68 .47 This general behavior of the accommodation coefficient substantiates findings reported earlier by Oliver (13) for other gas-metal systems. The experimentally determined values of the accommodation coefficient are applied to a theoretical relation obtained by application of the theory of absolute reaction rates (10). The theoretical expression is shown to be in semiquantitative agreement with the experimental data. In PART II the "hot wire" method is used to determine the heat of dissociation of iodine. The experimentally determined value is 36.9 kcal/mole at 600°K. The presently accepted value for this temperature is 35.17 kcal/mole. Provided a wire can be found which is not corroded by fluorine, the present results suggest a useful method for determining the heat of dissociation of fluorine.

Item Type:Thesis (Engineer's thesis)
Subject Keywords:Aeronautical engineering
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Aeronautics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Farber, Milton (advisor)
  • Penner, Stanford S. (advisor)
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1951
Record Number:CaltechETD:etd-03172009-085837
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:987
Deposited By: Imported from ETD-db
Deposited On:17 Mar 2009
Last Modified:24 Apr 2023 21:18

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