Download or read book Electron Capture and Target Ionization in Collisions of Bare Projectile Ions Incident on Helium written by Jefferson L. Shinpaugh and published by . This book was released on 1990 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electron Emission in Heavy Ion Atom Collisions written by Nikolaus Stolterfoht and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron EM reviews the theoretical and experimental work of the last 30 years on continuous electron emission in energetic ion-atom collisions. High incident energies for which the projectile is faster than the mean orbital velocity of the active electron are considered. Emphasis is placed on the interpretation of ionization mechanisms. They are interpreted in terms of Coulomb centers associated with the projectile and target nuclear fields which strongly interact with the outgoing electron. General properties of the two-center electron emission are analyzed. Particular attention is given to screening effects. A brief overview of multiple ionization processes is also presented. The survey concludes with a complete compilation of experimental studies of ionization cross sections.
Download or read book Projectile Electron Capture and Loss Accompanying Target Ionization for Highly charged Oxygen Ions Colliding with Helium written by Reynold N. Price and published by . This book was released on 1988 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High energy Ion atom Collisions written by Dénes Berényi and published by Springer. This book was released on 1988 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Atomic Processes in Electron Ion and Ion Ion Collisions written by F. Brouillard and published by Springer. This book was released on 1986 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book On the Role of Projectile Electrons in an Independent Electron Model Description of Dressed Ion Impact on Atoms written by Gerald Schenk and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The presence of electrons on ions which collide with neutral atoms constitutes a challenge to theoretical descriptions of the collision dynamics. These collisions pose quantum-mechanical many-body problems that cannot be fully solved; one has to resort to approximations, such as the independent electron model (IEM), in which the N-electron problem is reduced to N single-electron problems. The time-development of a given electron is governed by the nuclear Coulomb potentials and an electronic mean-field potential formed by the other electrons. This framework is used in the present work to explore the active role of projectile electrons in collisions of dressed boron- and carbon-ions with neon atoms, as well as the seemingly simple HeHe collision system. In the present IEM description the collision problem is expressed in the form of time-dependent Schrdinger equations with a common single-electron Hamiltonian. The single-electron equations are solved numerically with a two-centre basis expansion method in which the continuum is represented by dynamically generated basis states. From these calculations single-electron transition amplitudes are obtained and many-electron quantities are computed with different statistical final-state analyses, which do or do not respect the Pauli exclusion principle. In BNe collisions transfer ionization processes that involve electrons at both centres were found to contribute to target multiple ionization coincident with an unchanged projectile charge state. Total cross sections for collision channels where the projectile charge state is changed are presented for BNe and CNe collisions. The present method reliably provides total cross sections for most collision channels, except for the loss of projectile electrons. The contributions of these collision channels to the net recoil ion production are investigated. These results are compared with those for collisions of equicharged bare helium and lithium ions with neon. In a modification of the present approach a piecewise definition of the common Hamiltonian is proposed. It ensures the correct asymptotic behaviour of the mean-field potential at large internuclear distances before the collision for active electrons of both centres. The model is applied to the HeHe collision system and compared with the (unmodified) present approach.
Download or read book Coincidence Measurements of Electron Capture and Loss in Ion atom Collisions written by and published by . This book was released on 1990 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Collisions between fast, fully stripped projectiles and atomic targets predominantly result in target electrons being ejected to the continuum. For fast partially stripped projectiles which bring weakly bound electrons into the collision, projectile ionization can also contribute to the observed electron spectra. At lower impact velocities, electron capture by the projectile ion becomes important and higher order processes, often referred to as transfer ionization, can be a significant source of free electrons. In recent years, coincidence techniques have been used to evaluate the relative importance of electron capture and loss in free electron production, to separate the capture and loss contributions from those resulting from target ionization alone, and to provide more detailed information about electron capture and loss mechanisms than is available from total cross section measurements. A brief survey of these experiments will be presented. 23 refs., 9 figs.
Download or read book Physics Briefs written by and published by . This book was released on 1992 with total page 1156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1990 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electron Capture Into Excited States by Helium Ions written by Lambert Wolterbeek Muller and published by . This book was released on 1971 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1988 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Theory of Heavy Ion Collision Physics in Hadron Therapy written by and published by Academic Press. This book was released on 2012-12-31 with total page 483 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Quantum Chemistry presents surveys of current topics in this rapidly developing field that has emerged at the cross section of the historically established areas of mathematics, physics, chemistry, and biology. It features detailed reviews written by leading international researchers. This volume focuses on the theory of heavy ion physics in medicine. - Presents surveys of current topics in this rapidly developing field - Features detailed reviews written by leading international researchers - Focuses on the theory of heavy ion physics in medicine
Download or read book Collision of Fast Highly Charged Ions in Gas Targets written by and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Electron-capture, ionization, and recoil-ion-production cross sections are measured and calculated for fast highly charged projectiles in hydrogen and rare-gas targets. Recoil-ion-production cross sections are found to be large; the low energy and high charge states of the recoil ions make them useful for subsequent collision studies.
Download or read book Ionization and Charge Transfer in High energy Ion atom Collisions written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Multiple Electron Capture in Close Ion atom Collisions written by and published by . This book was released on 1989 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Collisions in which a fast highly charged ion passes within the orbit of K electron of a target gas atom are selected by emission of a K x-ray from the projectile or target. Measurement of the projectile charge state after the collision, in coincidence with the K x-ray, allows measurement of the charge-transfer probability during these close collisions. When the projectile velocity is approximately the same as that of target electrons, a large number of electrons can be transferred to the projectile in a single collision. The electron-capture probability is found to be a linear function of the number of vacancies in the projectile L shell for 47-MeV calcium ions in an Ar target. 18 refs., 9 figs.
Download or read book Structure and Collisions of Ions and Atoms written by I.A. Sellin and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: The central subject of this volume is the atomic and molecular physics of heavy par ticles as investigated with charged particle accelerators. The natural division be tween atomic structure and ion-atom collision studies, and the similar division be tween the theoretical and experimental branches of these subjects, are reflected in a parallel subdivision into corresponding chapters. In addition, one chapter is de voted to the important interface between atomic and molecular physics with condensed matter physics. A principal aim of the present volume is to provide a compact de scription of a number of current interests and trends within the heavy particle structure and collisions field in a sufficiently general, non-specialized way that interested scientists who wish to become acquainted with such interests and trends can do so without becoming bogged down in excessive archival detail. It is, therefore, hoped that the book will be of some use to advanced students who seek a general in troduction to these subjects. Numerous, more specialized, archival review articles are frequently referred to in each chapter for the benefit of those who seek more detailed knowledge about particular topics discussed. The editor wishes to acknowledge the support of two U. S. government agencies: the Office of Naval Research and the National Science Foundation, during the preparation of this volume. Sincere thanks are due Mrs. Betty Thoe for her excellent editorial work on the various manuscripts and Mrs.
Download or read book Screening antiscreening Effect in Ion atom Collisions written by Hans-Peter Hülskötter and published by . This book was released on 1990 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
