Author: Edward E. Donaldson
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
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In investigations of the adsorption of nitrogen on solid surfaces, it was shown that when nitrogen molecules are either bombarded by electrons or when they encounter an incandescent metal surface, atoms of nitrogen may be produced which sorb much more readily than the parent molecule. Thus the activated state was shown to be atomic. Burial of argon ions in nickel was studied. It was learned that the sticking probability for these ions depends upon whether the nickel surface is in a cold-worked or an annealed condition (highest sticking probability in the case of cold-worked nickel). This suggests that either grain boundaries or dislocations may provide sites for adsorption but neither possibility can yet be eliminated. Desorption by photons, electrons and ions was observed. Photon and electron bombardment desorption studies demonstrated that desorption occurs by way of an intermediate activated surface state while ion bombardment desorption was observed only as a secondary process in ion burial studies. Desorption by thermal means permitted the determination of energy with which ions are bound in the metal. (Author).
Author: S.E. Donnelly
Publisher: Springer
ISBN: 1489936807
Category : Science
Languages : en
Pages : 458
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The NATO Advanced Research Workshop on Fundamental Aspects of Inert Gases in Solids, held at Bonas, France from 16-22 September 1990, was the fifth in a series of meetings that have been held in this topic area since 1979. The Consultants' Meeting in that year at Harwell on Rare Gas Behaviour in Metals and Ionic Solids was followed in 1982 by the Jiilich Inter national Symposium on Fundamental Aspects of Helium in Metals. Two smaller meetings have followed-a CECAM organised workshop on Helium Bubbles in Metals was held at Orsay, France in 1986 while in February 1989, a Topical Symposium on Noble Gases in Metals was held in Las Vegas as part of the large TMS/AIME Spring Meeting. As is well known, the dominating feature of inert gas atoms in most solids is their high heat of solution, leading in most situations to an essentially zero solubility and gas-atom precipita tion. In organising the workshop, one particular aim was to target the researchers in the field of inert-gas/solid interactions from three different areas--namely metals, tritides and nuclear fuels-in order to encourage and foster the cross-fertilisation of approaches and ideas. In these three material classes, the behaviour of inert gases in metals has probably been most studied, partly from technological considerations-the effects of helium production via (n, a) reac tions during neutron irradiation are of importance, particularly in a fusion reactor environ ment-and partly from a more fundamental viewpoint.
Author: Donald J. Kirwan
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
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Author: DANIEL G. BILLS
Publisher:
ISBN:
Category :
Languages : en
Pages : 1
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Author: Richard Maling Barrer
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Franklin Charles Hurlbut
Publisher:
ISBN:
Category :
Languages : en
Pages : 46
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Author: Charles T. Rettner
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 392
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Book Description
This book provides a comprehensive overview of what is currently one of the most active areas within chemical physics. It presents the history, status and future direction of the broad field of dynamical studies of gas-surface collisions, with an emphasis on problems of a chemical nature. Dynamics of Gas-Surface Interactions discusses a selection of important topics and provides a balanced picture of the whole field. It is written by experts in the respective subjects and no previous volume has offered such detailed coverage. This book will provide a valuable introduction to the subject for final year undergraduates and graduate students, as well as an important reference work for all those involved in this exciting area.
Author:
Publisher:
ISBN: 9780335040407
Category :
Languages : en
Pages :
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Author: W.A. Steele
Publisher: Elsevier
ISBN: 0080531199
Category : Technology & Engineering
Languages : en
Pages : 909
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Book Description
The fact that the surfaces of real solids are geometrically distorted and chemically non-uniform has long been realized by the scientists investigating various phenomena occurring on solid surfaces. Even in the case when diffraction experiments show a well-organized bulk solid structure, the surface atoms or molecules will usually exhibit a much smaller degree of surface organization. In addition to the results obtained from electron diffraction, this can be seen in the impressive images obtained from STM and AFM microscopies. This geometric and chemical disorder is the source of the energetic heterogeneity for molecules adsorbing on real solid surfaces. Hundreds of papers have been published showing that this heterogeneity is a major factor in determining the behaviour of real adsorption systems.Studies of adsorption on energetically heterogeneous surfaces have proceeded along three somewhat separate paths, with only minor coupling of ideas. One was the study of adsorption equilibria on heterogeneous solid surfaces. The second path was the study of time evolution of adsorption processes such as surface diffusion or adsorption-desorption kinetics on heterogeneous surfaces, and the third was the study of adsorption in porous solids, or more generally, adsorption in systems with limited dimensions. The present monograph is a first attempt to provide a synthesis of the ways that surface geometric and energetic heterogeneities affect both the equilibria and the time evolution of adsorption on real solids. The book contains 17 chapters written by a team of internationally recognized specialists, some of whom have already published books on adsorption.
Author:
Publisher:
ISBN:
Category : Military research
Languages : en
Pages : 572
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