Reactive Scattering from Elemental Semiconductor Surfaces with a Modulated Molecular Beam Technique PDF Download
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Author: James Alan Schwarz
Publisher:
ISBN:
Category : Scattering (Physics)
Languages : en
Pages : 388
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Author: James Alan Schwarz
Publisher:
ISBN:
Category : Scattering (Physics)
Languages : en
Pages : 388
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Author: Alfred Akpoveta Susu
Publisher:
ISBN:
Category : Germanium crystals
Languages : en
Pages : 598
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![Reactive and Nonreactive Scattering of Modulated Molecular Beams from Well Characterized Platinum Single Crystal Surfaces. [Mechanism, Rainbow Scattering, Angular Distribution]. PDF](https://books.google.com/books/content/images/frontcover/96WuAQAACAAJ?fife=w80-h100)
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Languages : en
Pages :
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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.
Author:
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Category : Dissertation abstracts
Languages : en
Pages : 464
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Author:
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Category :
Languages : en
Pages : 12
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Resonantly enhanced multiphoton ionization (REMPI) laser spectroscopic and molecular beam-surface scattering techniques are coupled to study inelastic and reactive gas-surface scattering with state-to-state specificity. Rotational, vibrational, translational and angular distributions have been measured for the inelastic scattering of HCI and N 2 from Au(111). In both cases the scattering is direct-inelastic in nature and exhibits interesting dynamical features such as rotational rainbow scattering. In an effort to elucidate the dynamics of chemical reactions occurring on surfaces we have extended our quantum-resolved scattering studies to include the reactive scattering of a beam of gas phase H-atoms from a chlorinated metal surface M-CI. The nascent rotational and vibrational distributions of the HCI product are determined using REMPI. The thermochemistry for this reaction on Au indicates that the product formation proceeding through chemisorbed H-atoms is slightly endothermic while direct reaction of a has phase H-atom with M-CI is highly exothermic (ca. 50 kcal/mole). Details of the experimental techniques, results and implications regarding the scattering dynamics are discussed. 55 ref., 8 fig.
Author: Stanford University. Center for Materials Research
Publisher:
ISBN:
Category :
Languages : en
Pages : 328
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Author:
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Category : Aeronautics
Languages : en
Pages : 892
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Author: Stanford University. Center for Materials Research
Publisher:
ISBN:
Category :
Languages : en
Pages : 320
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Author: Robert J. Kee
Publisher: John Wiley & Sons
ISBN: 1119186285
Category : Science
Languages : en
Pages : 793
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A guide to the theoretical underpinnings and practical applications of chemically reacting flow Chemically Reacting Flow: Theory, Modeling, and Simulation, Second Edition combines fundamental concepts in fluid mechanics and physical chemistry while helping students and professionals to develop the analytical and simulation skills needed to solve real-world engineering problems. The authors clearly explain the theoretical and computational building blocks enabling readers to extend the approaches described to related or entirely new applications. New to this Second Edition are substantially revised and reorganized coverage of topics treated in the first edition. New material in the book includes two important areas of active research: reactive porous-media flows and electrochemical kinetics. These topics create bridges between traditional fluid-flow simulation approaches and transport within porous-media electrochemical systems. The first half of the book is devoted to multicomponent fluid-mechanical fundamentals. In the second half the authors provide the necessary fundamental background needed to couple reaction chemistry into complex reacting-flow models. Coverage of such topics is presented in self-contained chapters, allowing a great deal of flexibility in course curriculum design. • Features new chapters on reactive porous-media flow, electrochemistry, chemical thermodynamics, transport properties, and solving differential equations in MATLAB • Provides the theoretical underpinnings and practical applications of chemically reacting flow • Emphasizes fundamentals, allowing the analyst to understand fundamental theory underlying reacting-flow simulations • Helps readers to acquire greater facility in the derivation and solution of conservation equations in new or unusual circumstances • Reorganized to facilitate use as a class text and now including a solutions manual for academic adopters Computer simulation of reactive systems is highly efficient and cost-effective in the development, enhancement, and optimization of chemical processes. Chemically Reacting Flow: Theory, Modeling, and Simulation, Second Edition helps prepare graduate students in mechanical or chemical engineering, as well as research professionals in those fields take utmost advantage of that powerful capability.
Author: Stanford University
Publisher:
ISBN:
Category :
Languages : en
Pages : 556
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