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Author: Afzal Chaudhry Publisher: Springer Science & Business Media ISBN: 1441969470 Category : Science Languages : en Pages : 236
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: Afzal Chaudhry Publisher: Springer Science & Business Media ISBN: 1441969470 Category : Science Languages : en Pages : 236
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: S.P. Khare Publisher: Springer Science & Business Media ISBN: 1461506115 Category : Science Languages : en Pages : 362
Book Description
An understanding of the collisions between micro particles is of great importance for the number of fields belonging to physics, chemistry, astrophysics, biophysics etc. The present book, a theory for electron-atom and molecule collisions is developed using non-relativistic quantum mechanics in a systematic and lucid manner. The scattering theory is an essential part of the quantum mechanics course of all universities. During the last 30 years, the author has lectured on the topics presented in this book (collisions physics, photon-atom collisions, electron-atom and electron-molecule collisions, "electron-photon delayed coincidence technique", etc.) at many institutions including Wayne State University, Detroit, MI, The University of Western Ontario, Canada, and The Meerut University, India. The present book is the outcome of those lectures and is written to serve as a textbook for post-graduate and pre-PhD students and as a reference book for researchers.
Author: L Christophorou Publisher: Elsevier ISBN: 0323143016 Category : Science Languages : en Pages : 716
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: Peeyush Sahay Publisher: ISBN: Category : Languages : en Pages : 152
Book Description
Electron impact excitation phenomena play an important role in atomic and molecular physics. The different energy levels of an atom or molecule interact differently with incoming electrons with different energies and that affects the excitation of the energy levels of the atoms and molecules. Studies involving electron impact excitation process are generally conducted with optical emission techniques or by the electron energy loss method. In the present study, for the first time, cavity ringdown spectroscopy (CRDS) has been used to investigate electron impact excitation phenomena of electronatom collision processes. The technique, i.e., electron impact excitation-cavity ringdown spectroscopy (EIE-CRDS), was employed for the purposes of fundamental study and of real-time applications. The fundamental study which was carried out in terms of determining electron impact excitation cross section (EIECS) has been demonstrated by measuring EIECS of a few excited levels of mercury (Hg) atom. For the application side, the EIE-CRDS technique has been employed for trace element detection. This dissertation first describes the fundamentals of electron impact excitation cavity ringdown spectroscopy (EIE-CRDS); afterwards its applications are demonstrated. A novel method of measuring excitation cross sections using this EIE-CRDS technique has been explained. In this method, first the excitation of atoms are achieved by electron impact excitation process, subsequently, CRDS measured absolute number density is utilized to determine the absolute EIECS values. Steps of the method are described in detail. Applicability of the method is demonstrated by measuring EIECS of three different energy levels of Hg, namely 6s6p 3P0, 6s6p 3P1, and 6s7s 3S1, and the obtained values are in agreement with those reported in the literature. Secondly, the EIE-CRDS technique was employed to investigate the absorption spectrum of mercury atom in the vicinity of 404.65 nm, corresponding to the transition 6s7s 3S1-> 6s6p 3P0 levels of mercury. Elemental mercury was measured using a laser of wavelength 404.65 nm. The technological feasibility of developing a portable size instrument for mercury detection was explored. Subsequently, a portable size, dual-mode, plasma-CRDS based prototype instrument, capable of real-time trace element monitoring, was developed. The design, functioning, and specifications of the instrument are also explained.
Author: Krishan K. Sud Publisher: Springer Science & Business Media ISBN: 1461542596 Category : Science Languages : en Pages : 426
Book Description
Contemporary research in atomic and molecular physics concerns itself with studies of interactions of electron, positron, photons, and ions with atoms, molecules, and clusters; interactions of intense ultrashort laser interaction with atoms, molecules, and solids; laser assisted atomic collisions, optical, and magnetic traps of neutral atoms to produce ultracold and dense samples; high resolution atomic spectroscopy and experiments by using synchrotron radiation sources and ion storage rings. In recent years, important advances have been made in the experimental as well as theoretical understanding of atomic and molecular physics. The advances in atomic and molecu lar physics have helped us to understand many other fields, like astrophyics, atmo spheric physics, environmental science, laser physics, surface physics, computational physics, photonics, and electronics. XII National Conference on Atomic and Molecular Physics was held at the Physics Department, M. 1. S. University, Udaipur from 29th Dec. 1998 to 2ndJan. 1999 under the auspices of the Indian Society of Atomic and Molecular Physics. This volume is an outcome of the contributions from the invited speakers at the conference. The volume contains 24 articles contributed by the distinguished scientists in the field. The contrib utors have covered a wide range of topics in the field in which current research is being done. This also reflects the trend of research in this field in Indian universities and research institutes. We are grateful to the national programme committee, national, and local organiz ing committees, and members of the Physics Department and Computer Centre, M. 1.
Author: Jürgen Hinze Publisher: Springer Science & Business Media ISBN: 1489921486 Category : Science Languages : en Pages : 353
Book Description
The papers collected in this volume have been presented during a workshop on "Electron-Atom and Molecule Collisions" held at the Centre for Interdisciplinary Studies of the University of Bielefeld in May 1980. This workshop, part of a larger program concerned with the "Properties and Reactions of Isolated Molecules and Atoms," focused on the theory and computational techniques for the quanti tative description of electron scattering phenomena. With the advances which have been made in the accurate quantum mechanical characterisation of bound states of atoms and molecules, the more complicated description of the unbound systems and resonances important in electron collision processes has matured too. As expli cated in detail in the articles of this volume, the theory for the quantitative explanation of elastic and inelastic electron molecule collisions, of photo- and multiple photon ionization and even for electron impact ionization is well developed in a form which lends itself to a complete quantitative ab initio interpretation and pre diction of the observable effects. Many of the experiences gained and the techniques which have evolved over the years in the com putational characterization of bound states have become an essential basis for this development. To be sure, much needs to be done before we have a complete and detailed theoretical understanding of the known collisional processes and of the phenomena and effects, which may still be un covered with the continuing refinement of the experimental tech niques.
Author: Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
The research conducted under this project is in the general area of atomic and molecular collisions. The optical method has been a very successful tool for measuring electron-impact excitation cross sections. The experiments outlined in the preceding paragraph provides a new approach for studying excitation into the resonant levels. To determine the cross sections for exciting a resonant level, one must detect the radiative transitions from the resonant level to the lower non-resonant levels as well as to the ground level and measure their optical emission cross sections.
Author: H. Ehrhardt Publisher: Springer Science & Business Media ISBN: 1489914897 Category : Science Languages : en Pages : 265
Book Description
This volume contains the invited papers and selected contributed papers presented at the biennial International Symposium on ELECTRON COLLISIONS WITH MOLECULES, CLUSTERS AND SURF ACES held at Royal Holloway, University of London from 29th to 30th July, 1993. This Symposium was a Satellite Meeting of the XVIII International Conference on the Physics of Electronic and Atomic Collisions (ICPEAC) and follows a 16 year tradition of Satellite Conferences in related areas of collisions held in association with previous ICPEAC's. In the past each of these electron -molecule symposia covered the broad field of electron-molecule scattering at rather low energies, but also included hot topics. This time as well as covering the whole field, well defined electron collisions with clusters and with particles in the complex potential of a surface were emphasized. Not many details are known about such collisions, although they become more and more important in surface characterisation, plasma-wall interactions, electron induced desorption and reorganisation of adsorbed particles. Recently, much work, theoretical and experimental, has been devoted to electron collisions with rather large carbon, silicon and halogen containing molecules. These problems are of relevance in plasma assisted thin film formation and etching of surfaces and can now be approached with advanced theoretical methods and experimental equipment.
Author: Afzal Chaudhry
Author: Afzal Chaudhry
Author: Sen-tsuen Chen
Author: Frits Willem Evert Knoop
Author: S.P. Khare
Author: L Christophorou
Author: Peeyush Sahay
Author: Krishan K. Sud
Author: Jürgen Hinze
Author: 
Author: H. Ehrhardt