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 Charge Transfer and Excitation 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: 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.
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 High energy Ion atom Collisions written by Dénes Berényi and published by Springer. This book was released on 1991 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 Atomic Collisions written by Earl W. McDaniel and published by Wiley-VCH. This book was released on 1993-05-10 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deals with elastic, inelastic and reactive collisions between heavy particles. The impact energy range extends from sub-thermal to energies at which nuclear forces become significant. Although the focus is on experiment, theory is integrated with experimental discussions. Scattering resonances, beam monochromators, particle detectors, coincidence measurements and laser photodetachment are among the topics covered. Includes extensive references and problem sets.
Download or read book Atomic Physics of Highly Ionized Atoms written by Richard Marrus and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 571 pages. Available in PDF, EPUB and Kindle. Book excerpt: The last decade has seen dramatic progress in the development of devices for producing mu1ticharged ions. Indeed it is now pos sible to produce any charge state of any ion right up through 92 fully-stripped uranium (U +). Equally dramatic progress has been achieved in the energy range of the available ions. As an example, fully-stripped neon ions have been produced in useable quantities with kinetic energies ranging from a few ev to more than 20 Gev. Interest in the atomic physics of multicharged ions has grown apace. In the fusion program, the spectra of these ions is an im portant diagnostic tool. Moreover the presence of mu1ticharged ions presents a serious energy loss mechanism in fusion devices. This fact has motivated a program to study the collision mech anisms involved. In another area, mu1ticharged ions are present in the solar corona and the interstellar medium and knowledge of their collision properties and spectra is essential to understand ing the astrophysics. Other possible applications are to x-ray lasers and heavy ion inertial fusion. On a more fundamental level, new possibilities for testing quantum electrodynamics with mu1ti charged ions have emerged.
Download or read book The Physics of Electronic and Atomic Collisions XXI International Conference written by Yukikazu Itikawa and published by American Inst. of Physics. This book was released on 2000-02-23 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International Conference on the Physics of Electronic and Atomic Collisions (ICPEAC) is the largest of the international conferences dealing with two-body dynamic interactions between photons, electrons, positrons, atoms, molecules, ions and clusters. These subjects are of fundamental importance in quantum physics and chemistry. They are also basic elementary processes in the fields of astrophysics, atmospheric science, gaseous electronics, plasma processing, nuclear fusion science and radiation physics and chemistry. This book includes all invited talks which cover fundamental physics (the nano-kelvin physics of Bose-Einstein condensation in atomic gases) to practical applications (ion beam treatment of cancer).
Download or read book Simultaneous Electron Capture and Excitation in Ion atom Collisions written by and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A review of recent efforts to observe simultaneous electron capture-and-K-shell excitation in ion-atom collisions is presented. This process which has been referred to as resonant-transfer-and-excitation (RTE), is qualitatively analogous to dielectronic recombination (inverse Auger transition) in free-electron-ion collisions, and, hence, is expected to be resonant. Experimentally, events having the correct signature for simultaneous capture-and-excitation are isolated by detecting projectile K x rays in coincidence with ions which capture a single electron. In a recent experiment involving 70-160 MeV S/sup 13 +/ ions incident on Ar, a maximum was observed in the yield of projectile K x rays associated with electron capture. This maximum is attributed to simultaneous capture - and excitation. The position (120 MeV) and width (60 MeV) of the observed maximum are in good agreement with theoretical calculations. The data indicate that RTE is an important mechanism for inner-shell vacancy production in the energy range studied.
Download or read book Lectures on Ion Atom Collisions written by Jörg Eichler and published by Elsevier. This book was released on 2005-09-23 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book Electronic and Atomic Collisions written by H. B. Gilbody and published by North Holland. This book was released on 1988 with total page 856 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electronic and Atomic Collisions written by H. B. Gilbody and published by North Holland. This book was released on 1988 with total page 890 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coincidence Measurements of Atomic Collisions written by Edgar Everhart and published by . This book was released on 1968 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: This describes a program in coincidence measurements of atomic collisions. After a violent single atomic collision both particles are studied to determine their state of ionization (after the collision) and the inelastic energy loss associated with that collision. The argon ion-atom collision, and similar neon and krypton collision are studied. In some cases structure is found in the inelastic energy losses wherein two or three discrete values of this energy loss are found at certain energies on scattering angles. The pertinent region for argon-argon collisions is at 25 KeV and 16 degrees, for neon-neon collisions it is at 200 KeV and 8 degrees, and for krypton-krypton collisions the structure is found at 25 KeV, and 9 degrees. (Author).
Download or read book Coincidence Measurements of Electron Capture and Target Ionization in Multiply Charged Au Q He Ne Collisions written by and published by . This book was released on 1983 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ion Atom Collisions written by Michael Schulz and published by Walter de Gruyter GmbH & Co KG. This book was released on 2019-10-21 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: The few-body problem (FBP), the essence of which is the Schrödinger equation is not solvable for more than two interacting particles. Atomic collisions are ideally suited to study the FBP because the underlying force is essentially understood and because simple systems can be studied for which kinematically complete experiments are feasible. The book would cover various experimental and theoretical approaches in atomic collision research.
Download or read book A New Technique for the Study of Charge Transfer in Multiply Charged Ion ion Collisions written by and published by . This book was released on 1994 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: While large cross sections (>10−16 cm2) have been predicted for resonant charge transfer in ion-ion collisions, no experimental data exist for multiply charged systems. A novel technique is being developed at the ORNL ECR facility to allow study of symmetric charge exchange in multiply charged ion-ion collisions using a single ion source. Specific intra-beam charge transfer collisions occurring in a well-defined interaction region labeled by negative high voltage are identified and analyzed by electrostatic analysis in combination with ion time-of-flight coincidence detection of the collision products. Center-of-mass collision energies from 400 to 1000 eV are obtained by varying source and labeling-cell voltages. In addition, by the introduction of a target gas into the high-voltage cell, this labeling-voltage method allows measurement of electron-capture and -loss cross sections for ion-atom collisions. Consequently, higher collision energies can be investigated without the requirement of placing the ECR source on a high-voltage platform.
