Electron-Impact Total Ionization Cross Sections of Molecular Ions PDF Download
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Author: Leon Panetta
Publisher: DIANE Publishing
ISBN: 9781422318843
Category : Education
Languages : en
Pages : 8
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Book Description
Author: Leon Panetta
Publisher: DIANE Publishing
ISBN: 9781422318843
Category : Education
Languages : en
Pages : 8
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Book Description
Author: Yong-Ki Kim
Publisher:
ISBN:
Category :
Languages : en
Pages : 11
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Book Description
The theoretical basis for the binary-encounter-Bethe (BEB) model is outlined, and the model is compared to available experiments and other theories for samples of stable molecules, radicals, and positive ions. Possible directions for improving the BEB model also are presented. The BEB model does not contain empirical parameters, offers a simple equation and recipe for the ionization cross-section of individual molecular orbitals, and provides reliable cross-sections at low as well as high incident electron energies. The BEB model has been verified to produce reliable cross-sections for dozens of stable, neutral, large, and small molecules (e.g., H2, SF6), radicals, and singly-charged positive ions. Section 2 discusses the theoretical basis for the BEB model. Section 3 compares BEB cross-sections with available experimental data for N2, CF4, SF6, CH3, N2+ and SF5. It is clear that the BEB model can produce reliable ionization cross-sections for small as well as large, stable molecules. It also can produce reliable cross-sections for hydrocarbon radicals and singly-charged positive ions. However, the BEB cross sections do not agree well with the experimental data on radicals containing fluorine, CFx, SFx, and NFx, although the BEB cross-sections for the stable molecules CF4 and SF6 agree well with experiments. Section 4 examines unsolved issues and future prospects.
Author: T.D. Märk
Publisher: Springer Science & Business Media
ISBN: 3709140285
Category : Science
Languages : en
Pages : 395
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Book Description
It is perhaps surprising that a process which was one of the first to be studied on an atomic scale, and a process which first received attention over seven decades ago, continues to be the object of diverse and intense research efforts. Such is the case with the (seemingly) conceptually simple and familiar mechanism of electron impact ionization of atoms, molecules, and ions. Not only has the multi-body nature of the collision given ground to theoretical effort only grudgingly, but also the variety and subtlety of processes contributing to ionization have helped insure that progress has come only with commensurate work: no pain - no gain. Modern experimental methods have made it possible to effectively measure and explore threshold laws, differential cross sections, partial cross sections, inner-shell ionization, and the ionization of unstable species such as radicals and ions. In most instances the availability of experimental data has provided impetus and guidance for further theoretical progress.
Author: Afzal Chaudhry
Publisher: Springer Science & Business Media
ISBN: 1441969470
Category : Science
Languages : en
Pages : 236
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Book Description
The content of this book describes in detail the results of the present measurements of the partial and total doubly differential cross sections for the multiple-ionization of rare gas atoms by electron impact. These measurements show, beside other trends, the role of Auger transitions in the production of multiply ionized atoms in the region where the incident electron energy is sufficient to produce inner shell ionization. Other processes like Coster-Kronig transitions and shake off also contribute towards increasing the charge of the ions. The incident electron having energy of 6 keV, for example, in a collision with xenon atom can remove up to nine electrons! (*) X-ray-ion coincidence spectroscopy of the electron xenon atom collisions is also described. The present measurements of doubly differential cross sections for the dissociative and non-dissociative ionization of hydrogen, sulfur dioxide and sulfur hexa fluoride molecular gases by electron impact are also described in the text of this book. The results of the measurements for sulfur dioxide molecule show how this major atmospheric pollutant can be removed from the atmosphere by electron impact dissociation of this molecule. The present results of the measurements for sulfur hexa fluoride give an insight into the dissociation properties of this molecular gas, which is being so widely used as a gaseous insulator in the electrical circuits. The book also describes the present measurements of the polarization parameters of the fluorescence radiation emitted by the electron-impact-excited atoms of sodium and potassium. In these investigations the target atoms are polarized, therefore, the measurements of the polarization parameters give information about the electron atom interaction in terms of the interference, direct and exchange interaction channels.
Author: T.M. Jenkins
Publisher: Springer Science & Business Media
ISBN: 1461310598
Category : Science
Languages : en
Pages : 637
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Book Description
For ten days at the end of September, 1987, a group of about 75 scientists from 21 different countries gathered in a restored monastery on a 750 meter high piece of rock jutting out of the Mediterranean Sea to discuss the simulation of the transport of electrons and photons using Monte Carlo techniques. When we first had the idea for this meeting, Ralph Nelson, who had organized a previous course at the "Ettore Majorana" Centre for Scientific Culture, suggested that Erice would be the ideal place for such a meeting. Nahum, Nelson and Rogers became Co-Directors of the Course, with the help of Alessandro Rindi, the Director of the School of Radiation Damage and Protection, and Professor Antonino Zichichi, Director of the "Ettore Majorana" Centre. The course was an outstanding success, both scientifically and socially, and those at the meeting will carry the marks of having attended, both intellectually and on a personal level where many friendships were made. The scientific content of the course was at a very high caliber, both because of the hard work done by all the lecturers in preparing their lectures (e. g. , complete copies of each lecture were available at the beginning of the course) and because of the high quality of the "students", many of whom were accomplished experts in the field. The outstanding facilities of the Centre contributed greatly to the success. This volume contains the formal record of the course lectures.
Author: Eugen Illenberger
Publisher: Springer Science & Business Media
ISBN: 3662073838
Category : Science
Languages : en
Pages : 357
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Book Description
Most of the matter in our solar system, and, probably, within the whole universe, exists in the form of ionized particles. On the other hand, in our natural environ ment, gaseous matter generally consists of neutral atoms and molecules. Only under certain conditions, such as within the path oflightning or in several technical devices (e. g. gas discharges, rocket engines, etc. ) will some of the atoms and molecules be ionized. It is also believed that the chemistry of the earth's troposphere predomi nantly proceeds via reactions between neutral particles. (The complex system of atmospheric chemistry will be treated in one of the forthcoming volumes to this series. ) Why, then, are ions considered so important that hundreds oflaboratories all over the world (including some of the most prestigious) are involved in research pro grams on ions, covering many different facets, from biochemistry to physics? One may obtain as many different answers as there are research groups busy in this field. There is, however, one simple, common feature which makes it attractive to work with ions: since they carry one or more net elementary charges, they can easily be gui ded, focused or separated by appropriate electric and magnetic fields, and, last but not least, they can easily be detected. Apart from these advantages, which are welcome and appreciated by the researcher, the study of molecular ions can provide insight into very fundamental aspects of the general behavior of molecules.
Author: Charles Jean Joachain
Publisher:
ISBN: 9780444852359
Category : Collisions (Nuclear physics)
Languages : en
Pages : 703
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Book Description
Author: L Christophorou
Publisher: Elsevier
ISBN: 0323143016
Category : Science
Languages : en
Pages : 716
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Book Description
Electron-Molecule Interactions and Their Applications, Volume 1 presents a comprehensive account of electron-molecule interactions in high- and ultra-high-pressure gases and liquids. Topics covered include elastic scattering of electrons by molecules; excitation, ionization, and dissociation of molecules by electron impact; electron-molecule resonances; and electron attachment and detachment processes. This volume is comprised of seven chapters and begins with a discussion on non-resonant elastic scattering and rotational excitation of molecules by electrons, followed by a review of non-resonant vibrational and electronic excitation. The reader is then introduced to resonance effects in electron scattering; electron-induced ionization and dissociation of molecules; and electron-molecule resonances. The ionization mechanisms and types of ions produced are highlighted, along with differential ionization cross sections. The final two chapters focus on electron attachment and detachment processes, paying particular attention to modes of electron capture by molecules such as via negative-ion resonant states. The collisional dynamics for a few selected atomic reactants are also described. Physicists will find this book extremely helpful.
Author: Yong-Ki Kim
Publisher:
ISBN:
Category : Cross sections (Nuclear physics)
Languages : en
Pages :
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Book Description
This is a database primarily of total ionization cross sections of molecules by electron impact. The database also includes cross sections for a small number of atoms and energy distributions of ejected electrons for H, He, and H2. The cross sections were calculated using the Binary-Encounter-Bethe (BEB) model, which combines the Mott cross section with the high-incident energy behavior of the Bethe cross section. Selected experimental data are included.
Author:
Publisher: DIANE Publishing
ISBN: 9781422317990
Category :
Languages : en
Pages : 6
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Book Description
