Charge Transfer and Excitation in High-energy Ion-atom Collisions PDF Download
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Languages : en
Pages :
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Book Description
Coincidence measurements of charge transfer and simultaneous projectile electron excitation provide insight into correlated two-electron processes in energetic ion-atom collisions. Projectile excitation and electron capture can occur simultaneously in a collision of a highly charged ion with a target atom; this process is called resonant transfer and excitation (RTE). The intermediate excited state which is thus formed can subsequently decay by photon emission or by Auger-electron emission. Results are shown for RTE in both the K shell of Ca ions and the L shell of Nb ions, for simultaneous projectile electron loss and excitation, and for the effect of RTE on electron capture.
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Languages : en
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Book Description
Coincidence measurements of charge transfer and simultaneous projectile electron excitation provide insight into correlated two-electron processes in energetic ion-atom collisions. Projectile excitation and electron capture can occur simultaneously in a collision of a highly charged ion with a target atom; this process is called resonant transfer and excitation (RTE). The intermediate excited state which is thus formed can subsequently decay by photon emission or by Auger-electron emission. Results are shown for RTE in both the K shell of Ca ions and the L shell of Nb ions, for simultaneous projectile electron loss and excitation, and for the effect of RTE on electron capture.
Author: Jörg Eichler
Publisher: Elsevier
ISBN: 0080461115
Category : Science
Languages : en
Pages : 273
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Book Description
Atomic collisions offer some unique opportunities to study atomic structure and reaction mechanisms in experiment and theory, especially for projectiles of high atomic number provided by modern accelerators. The book is meant as an introduction into the field and provides some basic theoretical understanding of the atomic processes occurring when a projectile hits another atom. It also furnishes the tools for a mathematical description, however, without going deeper into the technical details, which can be found in the literature given. With this aim, the focus is on reactions, in which only a single active electron participates. Collisional excitation, ionization and charge transfer are discussed for collision velocities ranging from slow to comparable to the speed of light. For the highest projectile velocities, energy can be converted into mass, so that electron-positron pairs are created. In addition to the systematic treatment, a theoretical section specializes on electron-electron correlations and three chapters are devoted to selected highlights bordering to surface science and to physics with antiprotons. * Simple access to the theory of collisions between ions and atoms * Systematic treatment of basic features needed for an understanding * Mathematical details are omitted and referred to references * In order to bear out the essential ideas most clearly, a single active electron is assumed in most cases * In selected examples, theoretical results are confronted with experiment * Discussion supported by a large number of illustrations * Selected highlights in borderline fields are presented
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Languages : en
Pages :
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Book Description
Electron capture and loss by fast highly charged ions in a gas target, and ionization of the target by passage of the fast projectile beam, are fundamental processes in atomic physics. These processes, along with excitation, can be experimentally studied separately (''singles'') or together (''coincidence''). This paper is a review of recent results on singles measurements for electron capture and loss and for target ionization, for velocities which are generally high relative to the active electron, including recent ionization measurements for a nearly relativistic projectile. 11 refs., 6 figs.
Author: Dzevad Belkic
Publisher: CRC Press
ISBN: 9780367386450
Category :
Languages : en
Pages : 432
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Book Description
One of the Top Selling Physics Books according to YBP Library Services Suitable for graduate students, experienced researchers, and experts, this book provides a state-of-the-art review of the non-relativistic theory of high-energy ion-atom collisions. Special attention is paid to four-body interactive dynamics through the most important theoretical methods available to date by critically analyzing their foundation and practical usefulness relative to virtually all the relevant experimental data. Fast ion-atom collisions are of paramount importance in many high-priority branches of science and technology, including accelerator-based physics, the search for new sources of energy, controlled thermonuclear fusion, plasma research, the earth's environment, space research, particle transport physics, therapy of cancer patients by heavy ions, and more. These interdisciplinary fields are in need of knowledge about many cross sections and collisional rates for the analyzed fast ion-atom collisions, such as single ionization, excitation, charge exchange, and various combinations thereof. These include two-electron transitions, such as double ionization, excitation, or capture, as well as simultaneous electron transfer and ionization or excitation and the like--all of which are analyzed in depth in this book. Quantum Theory of High-Energy Ion-Atom Collisions focuses on multifaceted mechanisms of collisional phenomena with heavy ions and atoms at non-relativistic high energies.
Author: H. Schlumbohm
Publisher:
ISBN:
Category : Charge transfer
Languages : en
Pages : 32
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Book Description
Measurements of the photoemission caused by collisions of ground level He(+) and Ne(+) ions with Ar and Kr atoms have shown several multipletts of AR II and KR II within the investigated wavelength range of 3500 to 5500 A. At a high rate the charge transfer processes occur into excited states of Ar(+) and Kr(+). The reactions are endothermic with a deficit of internal energy between 6 and 19 eV. The cross sections measured for several chosen transitions start at characteristic threshold energies between 10 and 25 eV. Above the threshold the cross sections rise slowly with increasing energy when Ne(+) is the colliding ion and very fast for He(+). Above 50 to 100 eV the cross sections show nearly constant values. The minimum kinetic energy values are calculated, which can just fill up the deficits of internal energy, and are shown to be equal to the measured threshold energies. Thus it follows that the pseudo-crossing of the potential energy curves of the quasimolecules occurs at an energy value equal to the asymptotic level of the above curve.
Author: Dénes Berényi
Publisher:
ISBN:
Category : Heavy ion collisions
Languages : en
Pages : 286
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Book Description
Author: Dzevad Belkic
Publisher: World Scientific
ISBN: 9814407135
Category : Science
Languages : en
Pages : 335
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Book Description
The principal goal of this book is to provide state-of-the-art coverage of the non-relativistic three- and four-body theories at intermediate and high energy ion-atom and ion-molecule collisions. The focus is on the most frequently studied processes: electron capture, ionization, transfer excitation and transfer ionization. The content is suitable both for graduate students and experienced researchers. For these collisions, the literature has seen enormous renewal of activity in the development and applications of quantum-mechanical theories. This subject is of relevance in several branches of science and technology, like accelerator-based physics, the search for new sources of energy and high temperature fusion of light ions. Other important applications are in life sciences via medicine, where high-energy ion beams are used in radiotherapy for which a number of storage ring accelerators are in full operation, under construction or planned to be built worldwide. Therefore, it is necessary to review this field for its most recent advances with an emphasis on the prospects for multidisciplinary applications.This book is accompanied by Interdisciplinary Research on Particle Collisions and Quantitative Spectroscopy Volume 2 - Fast Collisions of Light Ions with Matter: Charge Exchange and Ionization.
Author: F. Brouillard
Publisher: Springer Science & Business Media
ISBN: 146845224X
Category : Technology & Engineering
Languages : en
Pages : 495
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Book Description
Four years after a first meeting in BADDECK, Canada, on the Physics of Ion-Ion and Electron-Ion collisions, a second Nato Advanced Study Institute, in HAl~/Lesse, Belgium, reexamined the subject which had become almost a new one, in consideration of the many important developments that had occured in the mean time. The developments have been particularly impressive in two areas : the di-electronic recombination of electrons with ions and the collisional processes of mUltiply charged ions. For dielectronic recombination, a major event was the obtainment, in 1983, of the first experimental data. This provided, at last, a non speculative basis for the study of that intricate and subtle process and strongly stimulated the theoretical activities. Multiply charged ions, on the other hand, have become popular, thanks to the development of powerful ion sources. This circumstance, together with a pressing demand from thermonuclear research for ionisation and charge exchange cross sections, has triggered systematic experimental investigations and new theoretical studies, which have contributed to considerably enlarge, over the last five years, our understanding of the collisional processes of multiply charged ions. Dielectronic recombination and multiply charged ions were therefore central points in the programme of the A.S.I. in HAN/Lesse and are given a corresponding emphasis in the present book.
Author: M. J. Coggiola
Publisher:
ISBN:
Category :
Languages : en
Pages : 763
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Book Description
Photon Impact: Atomic Photoionization - Experiment and Theory, Molecular Photoionization - Experiment and Theory, Photodetachment, Single Photon Dissociation, Multiphoton Processes in Atoms and Molecules; Electron-Atom Collisions: Elastic Processes, Alignment and Orientation, Resonances, General Threshold and Autoionization, (e,2e) and Post Collision Interactions, Spin-Dependent Processes; Electron-Molecule Collisions: Electronically Elastic Processes, Electronic Excitation and Ionization, Dissociation; Electron-Ion Collisions: Elastic, Inelastic, Ionizing, and Recombination; Positron-Atom, Positron-Molecule Collisions; Exotic Collisions; Atom-Atom Collisions: Ionization, Associative and Chemi-Ionization; Ion-Atom Collisions: Resonant Transfer and Excitation, Direct Excitation and Ionization, Autoionization, Electron Detachment, Quasimolecular Collisions, Alignment and Orientation, Production and Ionization of Multiply Charged Ions, Charge Transfer of Multiply Charged Ions, Capture into Continuum and Convoy Electrons, Radiative and Non-Radiative Capture at High Energies, Inner Shell Vacancy Decay; Ion(Atom)-Molecule Collisions: Rotational-Vibrational Excitation; Molecular Charge Transfer, Ionization and Detachment, Reactive Scattering, Three-Body Processes; Ion-Ion Collisions; Rydberg States and Reactions; Field Assisted Collisions; Clusters; Experimental Techniques.
Author: Dénes Berényi
Publisher: Springer
ISBN:
Category : Science
Languages : en
Pages : 568
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Book Description
These proceedings give fundamental information on the collision mechanisms of ions and atoms at relatively high energies and on their highly excited atomic states. The information derived from such studies can often be applied in other fields such as material analysis, dosimetry, the study of the upper atmosphere and controlled fusion. Phenomena involving the classical ion-atom collision fields, impact parameter dependences, quasimolecular and electron correlation effects, coherence phenomena, the electron and photon spectroscopy of highly charged projectile and recoil ions, the loss and capture of electrons, molecular and solid state effects, and different aspects of instrumentation are all discussed in this volume.
