Author: Steven Lynn Bernasek
Publisher:
ISBN:
Category :
Languages : en
Pages : 410
Book Description
Molecular Beam Scattering Studies of Energy Transfer and Chemical Reaction on Well Characterized Platinum Surfaces
Author: Steven Lynn Bernasek
Publisher:
ISBN:
Category :
Languages : en
Pages : 410
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 410
Book Description
ERDA Research Abstracts
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 756
Book Description
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 756
Book Description
Reactive and Nonreactive Scattering of Modulated Molecular Beams from Well Characterized Platinum Single Crystal Surfaces. [Mechanism, Rainbow Scattering, Angular Distribution].
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Reactive and nonreactive gas-surface interactions were studied by modulated molecular beam mass spectrometry on Pt(111) and stepped Pt(111) surfaces under ultra-high vacuum conditions. The angular distribution of helium atoms scattered from the stepped Pt(553) surface was measured as a function of the angle of incidence (polar, theta, and azimuthal, Phi). Rainbow scattering was observed indicating that the ordered array of steps and terraces exhibits a strongly periodic surface potential. In contrast, from the Pt(111) surface, the angular distribution of scattered helium atoms exhibits a sharp peak at the specular angle, characteristic of a smooth and well ordered surface. The interaction of hydrogen with platinum was investigated by studying the H2-D2 exchange reaction on the Pt(111) and the two stepped surfaces, Pt(553) and Pt(332). The production of HD was monitored. The mechanism of the H2-D2 exchange reaction was investigated on the Pt(111) and stepped Pt(332) surfaces. The dependence of the apparent reaction probability on surface temperature also indicates that the adsorption of hydrogen is an activated process on the Pt(111) surface, but not on the stepped Pt(332) surface. The energy barrier for hydrogen adsorption on Pt(111) deduced from this type of experiment is approx. 1.5 kcal/mole. On both surfaces, the mechanism of the recombination of adsorbed H and D atoms to form HD consists of a branched process at high crystal temperatures, with one of the branches connected in series with another reaction step at low temperatures. The process that isoperative over the entire temperature range studied, 25 to 800°C, has an activation energy and an apparent pre-exponential factor of E1 = 13.0 +- 0.4 kcal/mole and A1 = (8 +- 3) x 104 sec−1 for the Pt(332) surface and E1 = 15.6 +- 0.5 kcal/mole and A1 = (2.7 +- 1) x 105 sec −1 for the Pt(111) surface.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Reactive and nonreactive gas-surface interactions were studied by modulated molecular beam mass spectrometry on Pt(111) and stepped Pt(111) surfaces under ultra-high vacuum conditions. The angular distribution of helium atoms scattered from the stepped Pt(553) surface was measured as a function of the angle of incidence (polar, theta, and azimuthal, Phi). Rainbow scattering was observed indicating that the ordered array of steps and terraces exhibits a strongly periodic surface potential. In contrast, from the Pt(111) surface, the angular distribution of scattered helium atoms exhibits a sharp peak at the specular angle, characteristic of a smooth and well ordered surface. The interaction of hydrogen with platinum was investigated by studying the H2-D2 exchange reaction on the Pt(111) and the two stepped surfaces, Pt(553) and Pt(332). The production of HD was monitored. The mechanism of the H2-D2 exchange reaction was investigated on the Pt(111) and stepped Pt(332) surfaces. The dependence of the apparent reaction probability on surface temperature also indicates that the adsorption of hydrogen is an activated process on the Pt(111) surface, but not on the stepped Pt(332) surface. The energy barrier for hydrogen adsorption on Pt(111) deduced from this type of experiment is approx. 1.5 kcal/mole. On both surfaces, the mechanism of the recombination of adsorbed H and D atoms to form HD consists of a branched process at high crystal temperatures, with one of the branches connected in series with another reaction step at low temperatures. The process that isoperative over the entire temperature range studied, 25 to 800°C, has an activation energy and an apparent pre-exponential factor of E1 = 13.0 +- 0.4 kcal/mole and A1 = (8 +- 3) x 104 sec−1 for the Pt(332) surface and E1 = 15.6 +- 0.5 kcal/mole and A1 = (2.7 +- 1) x 105 sec −1 for the Pt(111) surface.
Energy Research Abstracts
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 420
Book Description
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 420
Book Description
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1096
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1096
Book Description
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 860
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 860
Book Description
Studies of Gas-surface Interactions at the (100) Crystal Face of Platinum by Molecular Beam Scattering, Low Energy Electron Diffraction, and Auger Electron Spectroscopy
Author: Lloyd Albert West
Publisher:
ISBN:
Category :
Languages : en
Pages : 590
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 590
Book Description
Publications of the National Institute of Standards and Technology ... Catalog
Author: National Institute of Standards and Technology (U.S.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 480
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 480
Book Description
ERDA Energy Research Abstracts
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 640
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 640
Book Description
ERDA Energy Research Abstracts
Author: United States. Energy Research and Development Administration. Technical Information Center
Publisher:
ISBN:
Category : Force and energy
Languages : en
Pages : 1680
Book Description
Publisher:
ISBN:
Category : Force and energy
Languages : en
Pages : 1680
Book Description