Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Download Positron Annihilation In Molecular Solids full books in PDF, epub, and Kindle. Read online Positron Annihilation In Molecular Solids ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Author : Irwin Spirn
Publisher :
ISBN 13 :
Total Pages : 144 pages
Book Rating : 4.:/5 (551 download)
Download or read book Positron Annihilation in Molecular Solids written by Irwin Spirn and published by . This book was released on 1966 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : P. Hautojärvi
Publisher : Springer Science & Business Media
ISBN 13 : 364281316X
Total Pages : 266 pages
Book Rating : 4.6/5 (428 download)
Download or read book Positrons in Solids written by P. Hautojärvi and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: In condensed matter initially fast positrons annihilate after having reached equi librium with the surroundings. The interaction of positrons with matter is governed by the laws of ordinary quantum mechanics. Field theory and antiparticle properties enter only in the annihilation process leading to the emergence of energetic photons. The monitoring of annihilation radiation by nuclear spectroscopic methods provides valuable information on the electron-positron system which can directly be related to the electronic structure of the medium. Since the positron is a positive electron its behavior in matter is especially interesting to solid-state and atomic physi cists. The small mass quarantees that the positron is really a quantum mechanical particle and completely different from any other particles and atoms. Positron physics started about 25 years ago but discoveries of new features in its interac tion with matter have maintained continuous interest and increasing activity in the field. Nowadays it is becoming part of the "stock-in-trade" of experimental physics.
Author : A.T. Steward
Publisher : Elsevier
ISBN 13 : 0323149820
Total Pages : 455 pages
Book Rating : 4.3/5 (231 download)
Download or read book Positron Annihilation written by A.T. Steward and published by Elsevier. This book was released on 2012-12-02 with total page 455 pages. Available in PDF, EPUB and Kindle. Book excerpt: Positron Annihilation focuses on the process of positron annihilation in different environments. Partitioned into two parts with 42 chapters, the book contains the contributions of authors who have done research on the annihilation of positrons, which brought about valuable information on the properties of matter. The first part of the book deals with lengthy review articles, including a survey of the physics of positron annihilation; positron annihilation in metals and the theory involved in the process; and positron annihilation in alkali halides and ionic crystals. Positronium formation and interaction in gases, molecular substances, and ionic crystals are also given attention. Gaseous positronics and positron annihilation in condensed gases and liquids are also discussed. The second part of the book focuses on developments on positron annihilation and the direction of research on this field. The studies concentrate on positron annihilation in various crystals, metals, mercury, liquefied gases, helium, and metal oxides. Numerical representations and analyses are presented to support the processes involved. The book can best serve the interest of those who want to explore further the annihilation of positrons.
Author : Allen P. Mills
Publisher :
ISBN 13 :
Total Pages : 360 pages
Book Rating : 4.3/5 (91 download)
Download or read book Positron Studies of Solids, Surfaces, and Atoms written by Allen P. Mills and published by . This book was released on 1986 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ole E. Mogensen
Publisher : Springer Science & Business Media
ISBN 13 : 3642851231
Total Pages : 279 pages
Book Rating : 4.6/5 (428 download)
Download or read book Positron Annihilation in Chemistry written by Ole E. Mogensen and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt: The only critical discussion available on the chemistry of the two "strange" light particles, the positron and positronium, with much space devoted to the excess electron. Positron annihilation allows the investigation of many unusual phenomena in the reaction kinetics of the positron, positronium, and excess electron, and in radiation chemistry and physics, while also providing important information on defects in solids.
Author : Alexander Matthew Cooper
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (13 download)
Download or read book Positron Annihilation in Molecular Liquid-solid Systems written by Alexander Matthew Cooper and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Alexander Matthew Cooper
Publisher :
ISBN 13 :
Total Pages : 274 pages
Book Rating : 4.:/5 (184 download)
Download or read book Positron Annihilation in Molecular Liquid-solid Systems (microfilm). written by Alexander Matthew Cooper and published by . This book was released on 1969 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Rados?aw Zaleski
Publisher : Trans Tech Publications Ltd
ISBN 13 : 3038134511
Total Pages : 172 pages
Book Rating : 4.0/5 (381 download)
Download or read book Progress in Positron Annihilation written by Rados?aw Zaleski and published by Trans Tech Publications Ltd. This book was released on 2010-12-30 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is indexed by Thomson Reuters CPCI-S (WoS). The aim of this special collection is to present recent progress made, and reflect current ideas, in research fields where positron and positronium are involved. The contents cover a wide range of positron-related research topics; including both fundamental (theoretical calculations, radiation chemistry, hyperfine interactions, positronium physics and chemistry) and applied (metal, polymer, thin film and other materials, development of experimental techniques) aspects.
Author : Jerry Y C Jean
Publisher : World Scientific
ISBN 13 : 9814487619
Total Pages : 426 pages
Book Rating : 4.8/5 (144 download)
Download or read book Principles And Applications Of Positron And Positronium Chemistry written by Jerry Y C Jean and published by World Scientific. This book was released on 2003-04-04 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive description of the principles and applications of positron and positronium chemistry. Pedagogical and tutorial in nature, it will be ideal for graduate students and researchers in the area of positron annihilation spectroscopy. The contributing authors are authoritative scientists prominent in the frontiers of research, actively pursuing positron annihilation research on chemical and applied systems.
Author : D. M. Schrader
Publisher : Elsevier Publishing Company
ISBN 13 :
Total Pages : 424 pages
Book Rating : 4.:/5 (44 download)
Download or read book Positron and Positronium Chemistry written by D. M. Schrader and published by Elsevier Publishing Company. This book was released on 1988 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the use and significance of positrons in several fields of chemistry, including chemical analysis, surface chemistry, quantum chemistry, the structure of molecular solids, radiation chemistry, the structures of supramolecular species (polymers, vesicles, micelles, etc.), clustering phenomena in gases, etc. Because the positron is an unfamiliar particle to most chemists, the first chapter provides an easily understood introduction to this fascinating chemical species. Applications of various positron techniques to practical problems in chemistry are described which will be interesting and useful to many chemists. Some will find new methods of enquiry into their own systems, and new ways of thinking about them. Practical details of how to set up experiments are given, and information about what can be learned from the data is provided. This is the first comprehensive treatment of the subject in almost 25 years. It will be of interest to those in all fields of chemistry as well as certain areas of biology and materials science. The book features an excellent subject index and a full authors' index and is illustrated by 139 graphs and drawings.
Author : Jerry Y. C. Jean
Publisher :
ISBN 13 : 9789814540148
Total Pages : 648 pages
Book Rating : 4.5/5 (41 download)
Download or read book Third International Workshop on Positron and Positronium Chemistry written by Jerry Y. C. Jean and published by . This book was released on 1990 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Positronium in Molecular Substances written by and published by . This book was released on 1973 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The progress of research in the behavior of positronium in molecular substances in the last several years is reviewed. The Ps atom can be treated as a solute in a liquid and the repulsive exchange force is the dominant force which reacts against the van der Waals attractive force. One of the most useful general relations found is the one between the pick-off quenching rate and the surface tension of the liquid. The pick-off quenching rate is found, in general, to be an additive property of the functional groups of a molecule. The quenching of the o-Ps atom by an active quenching agent in an inert solvent was found to be primarily diffusion controlled. Some deviations from the simple Arrhenius equation were found. For gases, more theoretical work on the collision problems of Ps with atoms or molecules is needed. For amorphous molecular solids, it is likely that the property of pick-off quenching of o-Ps is similar to that in liquids. However, in crystalline molecular solids, the situation is quite different. A few definite cases were found where a Ps atom does not form or exist. Further work in this area should be very interesting. The foregoing leads one to believe that positronium or positron annihilation can be useful in the study of fundamental properties of molecular liquids and solids. (auth).
Author : Paul Richard Guagliardo
Publisher :
ISBN 13 :
Total Pages : 255 pages
Book Rating : 4.:/5 (816 download)
Download or read book Positron Annihilation Studies of Solids and Surfaces written by Paul Richard Guagliardo and published by . This book was released on 2011 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt: [Truncated abstract] This thesis describes the first positron annihilation studies undertaken in the Atomic, Molecular and Surface Physics group in the School of Physics at the University of Western Australia (UWA). We have studied a range of systems with differing positron annihilation characteristics with the aim of characterising their defect properties, and in the process have gained insight into the interactions of positrons and positronium with materials. The project started with establishing a positron annihilation laboratory. This entailed developing procedures to produce and safely handle sealed 22Na sources, and testing positron annihilation instrumentation and experimental methods. The project evolved through collaboration with physicists, engineers, chemists, materials scientists, metallurgists and medical scientists and through a number of interesting experimental explorations of the physical phenomena affecting positron annihilation. An overview of these investigations and a thesis synopsis is given below. Chapter 1 is an introduction to positron annihilation techniques, concentrating on the interactions of positrons (and positronium) with materials, and on the spectroscopies that exploit the annihilation processes for the purpose of studying condensed matter systems. Chapter 2 describes the testing and optimisation of the positron annihilation lifetime spectrometer and Doppler broadening spectrometer. In Chapter 3, positron annihilation has been applied to study cation vacancies in oxides that exhibit ionic bonding. Such vacancies have a relative negative charge and so attract positrons, and the relatively low electron density at these sites causes enhanced positron lifetimes. Oxides considered in this work are (a) rutile, (Ti,Nb)O2, sintered in air and Ar; (b) tin oxide, (Sn,Nb)O2 sintered in air; (c) monoclinic zirconia, (Zr,Nb)O2; (d) pollucite, Cs(1-x)Al(1-x)Si(2+x)O6 and (e) Ta- and Ti-doped Zn2TiO4. All systems except (c) showed enhanced lifetimes when doping or off-stoichiometry was increased. In Chapter 4, positron annihilation has been used to study the nanoporosity of cementitious materials. The mechanical properties of these materials are heavily influenced by porosity, with the volume and size distribution of pores controlling both the strength and durability of the material...
Author : Koji Iwata
Publisher :
ISBN 13 :
Total Pages : 406 pages
Book Rating : 4.:/5 (318 download)
Download or read book Positron Annihilation on Atoms and Molecules written by Koji Iwata and published by . This book was released on 1997 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : P. E. Mallon
Publisher : World Scientific
ISBN 13 : 9812381449
Total Pages : 426 pages
Book Rating : 4.8/5 (123 download)
Download or read book Principles and Applications of Positron & Positronium Chemistry written by P. E. Mallon and published by World Scientific. This book was released on 2003 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive description of the principles and applications of positron and positronium chemistry. Pedagogical and tutorial in nature, it should be useful for graduate students and researchers in positron annihilation spectroscopy. The contributors are scientists in the frontiers of research.
Download or read book Slow Positron Study of Positronium Formation and Diffusion in Crystalline and Amorphous Ice written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of the present work has been to study the interaction of low energy positrons and of Ps with a molecular solid. As a first example we have chosen ice which has been extensively investigated both by conventional positron annihilation methods as well as by many other techniques. Unlike in metals, positrons injected into most molecular solids may have a certain probability to form Ps in the bulk of the material. The process by which Ps is formed in condensed molecular materials has been a matter of strong debate. According to the Ore model of Ps formation, which is recognized as being valid for low density gases, the positron during its slowing down picks off an electron from a molecule with which it simultaneously forms Ps. For energies below E/sub L/ = I-6.8 eV, where I is the lowest ionisation energy and 6.8 eV is the Ps binding energy in vacuum, this process is not energetically possible. Above an energy E/sub u/ approx. I the model predicts a reduction of the yield of stable Ps, because of rapid slowing down of the positron by ionisation or by splitting up again of a Ps atom which may have been formed. The energy range E/sub L/ less than or equal to E approximately less than E/sub u/ is the so-called Ore gap in gases. In the present work both crystalline and amorphous ice have been studied using positrons of energies in the range 0 to 4.5 keV. The experimental methods used were determination of the yields of 3.gamma.-annihilations as well as Doppler broadening measurements in the temperature range 45 to 150 K. The main results obtained were a determination of the Ps diffusion constant, and a demonstration that in the present experiments one contribution to the total Ps yield comes from positrons with typical Ore gap energies, and another contribution, due to spur processes, from positrons with initial energies of several hundred eV. 57 references, 9 figures.
Author : Atomic Energy of Canada Limited
Publisher :
ISBN 13 :
Total Pages : 35 pages
Book Rating : 4.:/5 (719 download)
Download or read book Time Distribution of Positron Annihilation in Liquids and Solids written by Atomic Energy of Canada Limited and published by . This book was released on 1959 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:
