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Author : K. Senkiw
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (93 download)
Download or read book Gas scattering from metal surfaces written by K. Senkiw and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Leon Trilling
Publisher :
ISBN 13 :
Total Pages : 31 pages
Book Rating : 4.:/5 (227 download)
Download or read book The Scattering of Gas Molecules from Metal Surfaces written by Leon Trilling and published by . This book was released on 1973 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes some recent findings in the mechanics of gas-surface interaction, and some experimental techniques developed for their laboratory study. It stresses the exchange of energy and momentum at the surface and incidentally suggests some of the molecular interactions which occur at orbital or entry velocities.
Author : Ricardo Diez Muino
Publisher : Springer Science & Business Media
ISBN 13 : 3642329551
Total Pages : 439 pages
Book Rating : 4.6/5 (423 download)
Download or read book Dynamics of Gas-Surface Interactions written by Ricardo Diez Muino and published by Springer Science & Business Media. This book was released on 2013-02-26 with total page 439 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives a representative survey of the state of the art of research on gas-surface interactions. It provides an overview of the current understanding of gas surface dynamics and, in particular, of the reactive and non-reactive processes of atoms and small molecules at surfaces. Leading scientists in the field, both from the theoretical and the experimental sides, write in this book about their most recent advances. Surface science grew as an interdisciplinary research area over the last decades, mostly because of new experimental technologies (ultra-high vacuum, for instance), as well as because of a novel paradigm, the ‘surface science’ approach. The book describes the second transformation which is now taking place pushed by the availability of powerful quantum-mechanical theoretical methods implemented numerically. In the book, experiment and theory progress hand in hand with an unprecedented degree of accuracy and control. The book presents how modern surface science targets the atomic-level understanding of physical and chemical processes at surfaces, with particular emphasis on dynamical aspects. This book is a reference in the field.
Author : Frank O. Goodman
Publisher : Elsevier
ISBN 13 : 0323154611
Total Pages : 352 pages
Book Rating : 4.3/5 (231 download)
Download or read book Dynamics of Gas-Surface Scattering written by Frank O. Goodman and published by Elsevier. This book was released on 2012-12-02 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamics of Gas-Surface Scattering deals with the dynamics of scattering as inferred from known properties of gases and solids. This book discusses measurements of spatial distributions of scattered atomic and molecular streams, and of the energy and momentum which gas particles exchange at solid surfaces. It also considers two regimes of scattering, both of which are associated with a lower range of incident gas energies: the thermal and structure scattering regimes. Comprised of 10 chapters, this book opens with a brief historical overview of the early experiments that investigated the dynamics of scattering of gases by surfaces. The discussion then turns to some elements of the kinetic theory of gases; intermodular potentials and interaction regimes; and classical-mechanical lattice models used in gas-surface scattering theory. The applications of molecular beams to the study of gas-surface scattering phenomena are also described. The remaining chapters focus on experiments and theories on scattering of molecular streams by surfaces of solids, with emphasis on thermal and structure regimes of inelastic scattering; quantum theory of gas-surface scattering; and quantum mechanical scattering phenomena. This text concludes with an analysis of energy exchange processes that may occur when a solid surface is completely immersed in a still gas. This monograph will be a valuable resource for students and practitioners of physics, chemistry, and applied mathematics.
Author : W. Eckstein
Publisher :
ISBN 13 :
Total Pages : 27 pages
Book Rating : 4.:/5 (871 download)
Download or read book Scattering of Rare Gas Ions from Metal Surfaces written by W. Eckstein and published by . This book was released on 1974 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book L'Origine et la naissance de Jésus-Christ written by and published by . This book was released on 1887 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Anthonius van Veen
Publisher :
ISBN 13 :
Total Pages : 200 pages
Book Rating : 4.:/5 (27 download)
Download or read book Sputtering and Scattering by Interaction of Low Energy Noble Gas Ions with Monocrystalline Metal Surfaces written by Anthonius van Veen and published by . This book was released on 1979 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John J. Hinchen
Publisher :
ISBN 13 :
Total Pages : 99 pages
Book Rating : 4.:/5 (227 download)
Download or read book Scattering of Thermal Energy Gas Beams by Metallic Surfaces Ii written by John J. Hinchen and published by . This book was released on 1967 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scattering of molecular gases from platinum and tantalum was studied using an ultra-high vacuum molecular beam apparatus. Beams of the rare gases, nitrogen, oxygen, methane and water vapor were used. The angle of maximum intensity of the scattered gas beams had a dependency on experimental variables that was in fair agreement with theory. Surface contamination and roughness affected the intensity and spatial distribution of scattered beams, but no difference between polycrystalline and single crystal metal surfaces was observed. By using phase-sensitive-detection techniques, the velocity of scattered molecules was found to vary with angular position about the surface. Energy and momentum coefficients were evaluated from the experimental data. Under certain conditions, discontinuities and negative values were found for these coefficients; such excursions in energy accommodation have been theoretically predicted. The experimental results were used in analysis of free molecule and slip flows. (Author).
Author : Alexander V. Bogdanov
Publisher : Springer Science & Business Media
ISBN 13 : 3540588027
Total Pages : 140 pages
Book Rating : 4.5/5 (45 download)
Download or read book Interaction of Gases with Surfaces written by Alexander V. Bogdanov and published by Springer Science & Business Media. This book was released on 1995-03-22 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interface phenomena are most fascinating because of the mixing of different scales and the interference of diverse physical processes. This makes it necessary to use different levels of description: microscopic, kinetic, and gas-dynamical. A unified quasiclassical approach is used to answer practical questions dealing with inelastic gas-surface scattering, the kinetics of adsorption layers, the evolution of inhomogeneities and defects at the surface, the Knudsen layer, the development of boundary conditions on the kinetic and gas-dynamical levels, the determination of exchange and slip coefficients, and so on.
Author : Azar Farjamnia
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (15 download)
Download or read book Gas-surface Interactions written by Azar Farjamnia and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The adsorption and dissociation of small molecules on metal surfaces are key steps in many industrial reactions. A detailed understanding of the dynamics of these reactions provides us with the ability to control the outcome and efficacy of the reactions. The molecule-metal interactions will lead to reorientation, energy redistribution, or bond dissociation in the molecule. The process is strongly depending upon the initial conditions, i. e. the incident energy and vibrational state of the molecule, and the surface temperature. We use a fully quantum approach to compute the dissociative sticking probability of the molecules at zero overage, on the surface of metal catalysts. We use density functional theory (DFT) based electronic structure calculations to construct a reaction path Hamiltonian (RPH) for reaction. Using well tested sudden methods for adding the effects of lattice motion into quantum reactive scattering calculations allows us to directly compare the results from our theory with molecular beam studies. Using these methods, we have explored the dissociative chemisorption of H2O, HOD, and D2O on Ni(111), and found that for this late barrier system, excitations in bending and stretching vibrational modes enhance the dissociative sticking. The motion of the lattice atoms near the dissociating molecule was found to modify the height of the barrier, leading to a strong variation in reactivity with surface temperature. We also studied the dissociative chemisorption of CO2 on Ni(100) and the Ni(711) stepped surface. The mechanism for dissociation is similar on the two surfaces, including the formation of a bent anionic chemisorption precursor state. Vibrational excitation of the incident CO2 molecule can enhance the reactivity for low incident energies, and the biggest efficacy corresponds to the bending mode that leads the molecule to the bent precursor state. The vibrationally inelastic scattering of methane molecules from a Ni(111) at low incident energies was studied and we found that the vibrational energy initially in one vibrational state, can distribute into other states upon collision. We have computed this energy distribution using SRP density functional which is a van der Walls correlation functional. At low incident energies the results are similar for PBE and SRP.
Author : Meirion Wynn Roberts
Publisher : Oxford University Press, USA
ISBN 13 :
Total Pages : 624 pages
Book Rating : 4.3/5 (91 download)
Download or read book Chemistry of the Metal-gas Interface written by Meirion Wynn Roberts and published by Oxford University Press, USA. This book was released on 1978 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Joe N Smith (Jr)
Publisher :
ISBN 13 :
Total Pages : 49 pages
Book Rating : 4.:/5 (227 download)
Download or read book Molecular Beam Scattering from Solid Surfaces: A Critical Review written by Joe N Smith (Jr) and published by . This book was released on 1972 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report reviews experimental studies of gas-surface scattering reported in the period from approximately 1969 through the first half of 1972. It emphasizes rare gas scattering from a variety of metal single crystals at incident energies from about 0.025 eV to nearly 20 eV, and includes a discussion of the various scattering regimes in that energy range. In addition, light gas scattering from LiF and certain highly structured metal surfaces is surveyed. The observation of single-phonon inelastic events are described. Recent studies of desorption phenomena are reviewed. A correlation of the various results is made and areas in which questions remain are indicated. Apart from parametric correlations, no attempt is made to assess the validity of the various theoretical models that have been developed to describe the scattering process. (Author).
Author : Steven Broeils Luitjens
Publisher :
ISBN 13 :
Total Pages : 158 pages
Book Rating : 4.:/5 (27 download)
Download or read book Scattering of Low Energy Noble Gas Ions from a Metal Surface written by Steven Broeils Luitjens and published by . This book was released on 1980 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Joseph Oliva
Publisher :
ISBN 13 :
Total Pages : 386 pages
Book Rating : 4.:/5 (318 download)
Download or read book Physical Processes in Positron Scattering at Metal Surfaces written by Joseph Oliva and published by . This book was released on 1979 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Frederick Clifford Tompkins
Publisher :
ISBN 13 :
Total Pages : 392 pages
Book Rating : 4.F/5 ( download)
Download or read book Chemisorption of Gases on Metals written by Frederick Clifford Tompkins and published by . This book was released on 1978 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jerry Elden Hurst
Publisher :
ISBN 13 :
Total Pages : 324 pages
Book Rating : 4.:/5 (287 download)
Download or read book A Molecular Beam Study of the Scattering of a Rare Gas from a Clean Well Characterized Metal Surface written by Jerry Elden Hurst and published by . This book was released on 1981 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Shengyuan Zhang
Publisher :
ISBN 13 :
Total Pages : 246 pages
Book Rating : 4.:/5 (71 download)
Download or read book Effects of Surface Temperature in Gas-surface Interaction written by Shengyuan Zhang and published by . This book was released on 2010 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: The scattering of H2 from Si(100) has been studied using pulsed molecular beam techniques and quantum state-specific detection methods. These studies can be used to test theoretical calculations and give insight into new theories of molecule-surface interactions, a fundamental study in a diverse field of science and technology. In this work, time-of-flight (TOF) spectra of the elastic scattering of H2(v=1. J=1) and H2(v=0, J=1) from clean Si were recorded over a wide range of surface temperatures. Two data processing strategies were developed to extract rich kinematic information from the scattering experiments, e.g., mean translational energy exchange, absolutely survival probability, and angular and speed distribution of the scattered molecules. No such set of quantitative results has been reported before for this system. Compared with close packed metal surfaces, these scattering experiments from a covalently bonded semiconductor surface showed a completely distinct dynamics, e.g. the finding of energy gain instead of loss from the substrate, much broader angular distribution and some counterintuitive surface temperature effects. From the studies of molecules/surface scattering experiments, the thermal excitation on Si(100) surface which depends on surface temperature can substantially alter the adsorption barrier and its distribution, and therefore changes the kinematics of scattered molecules. As a result, even the most basic understanding of the dynamics has to include phonon excitation and deexcitation of the silicon substrate.
