Chemical Reactions on Clean Surfaces, Using Modulated Atomic Beam Techniques PDF Download
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Author: R.L. Palmer
Publisher:
ISBN:
Category : Catalysts
Languages : en
Pages : 42
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Author: R.L. Palmer
Publisher:
ISBN:
Category : Catalysts
Languages : en
Pages : 42
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Author: J. N Smith (Jr)
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ISBN:
Category :
Languages : en
Pages : 81
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The hydrogen-deuterium exchange reaction on nickel was studied using modulated molecular beam techniques. When coupled with a surface preparation technique that allows one to grow clean single crystals in situ during the experiment, it is shown that the scattering of H2, D2, and HD is specularly directed while the product of the H2/D2 exchange is scattered. The reaction probability implies the importance of the normal component of momentum in controlling the reaction rate. From these data and from earlier studies of the pressure dependence of the reaction the Langmuir type of mechanism is favored over a direct collisional (Rideal) type of mechanism in the exchange reaction H2 + D2 yielding 2HD. Further, it is apparent from the data that the role played by sorbed H2 is important in such reactions on Ni surfaces. (Author).
Author: Robert L. Palmer
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ISBN:
Category :
Languages : en
Pages : 38
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The hydrogen-deuterium exchange reaction on nickel has been studied using modulated molecular beam techniques. When coupled with a surface preparation technique that allows one to grow clean single crystals during the experiment, the molecular beam techniques permit one to show that the scattering of all the isotopic molecular hydrogenic species is specularly directed, while the product of the chemical reaction is scattered according to a modified cos Tr law. The proposal to use varying rates of continuous deposition of metal to control the surface concentrations of the adsorbed species was shown to be inapplicable to the H2-D2 exchange, as the measured background gas pressure dependence was unaffected by this deposition. This pressure dependence was also shown to vary with background gas pressure. From the scattering data (at the higher pressure) it appears that both the reactants must be adsorbed prior to the formation of the product HD. (Author).
Author:
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Category : Military research
Languages : en
Pages : 854
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 384
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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author:
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Category : Government publications
Languages : en
Pages : 1352
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Author:
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ISBN:
Category : Science
Languages : en
Pages : 760
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Author: United States. Air Force. Office of Aerospace Research
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Category : Aeronautics, Military
Languages : en
Pages : 254
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 576
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Author: United States. Air Force. Office of Aerospace Research
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 586
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