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Thermionic Phenomena is the third volume of the series entitled The Collected Works of Irving Langmuir. This volume compiles articles written during the 1920's and early 1930's, the period when the science of thermionics is beginning to be of importance. This text is divided into two parts. The first part discusses vacuum pumps, specifically examining the effect of space charge and residual gases on thermionic currents in high vacuum. This part also explains fundamental phenomena in electron tubes having tungsten cathodes and the use of high-power vacuum tubes. The second part of this text looks into the electron emission and adsorbed films, specifically studying the relation between contact potentials and electrochemical action and other related topics on electron emission. This publication will be invaluable to those interested in the works of Langmuir, particularly on thermionic phenomena.
The Collected Works of Irving Langmuir, Volume 1: Low-Pressure Phenomena is a 16-chapter text that covers the early work of Irving Langmuir, beginning with his doctoral thesis written in 1906, focusing on the chemical and physical aspects of low-pressure phenomena. The first chapters deal with the dissociation of various gases produced by hot platinum wires and the convection and conduction of gases at high temperatures. The subsequent chapters consider the velocity of reactions in gases, the chemically active modification of hydrogen, and the dissociation of hydrogen into atoms. Considerable chapters are devoted to chemical reactions at very low pressures. The final chapters discuss the radiation as an important factor in chemical action and the mechanism of the catalytic action of platinum in the reactions between hydrogen and oxygen. This book is of value to physical chemists and physical chemistry researchers.
Atmospheric Phenomenon is composed of different essays written or co-authored by Irving Langmuir. The essays explore the different parts that form the atmosphere. A section of the book describes the evaporation of small spheres. Another section is about the radial flow in rotating liquids. The book also covers the light signals in aviation and navigation. An essay that describes the airplane tracks in the surface of stratus clouds is then provided. Some of the essays contained in a section in the book focus on the process of cloud seeding. This section explores such topics as smoke filters, cloud droplets, and water droplet trajectories. Another section in the book is especially devoted to the methods of cloud seeding using dry ice, silver iodide, and sodium chloride. The book can be a useful tool for aviation scientists, engineers in the field of aerial navigation, and individuals whose field of study is mainly on weather manipulation and control.
The collisions of neutral or charged gaseous particles with solid surfaces govern many physical and chemical phenomena, as has been The gas/solid phenomena in turn depend on a recognized for a long time. great variety of processes such as the charge transfer of the gas/solid interface, adsorption and desorption, the energy transfer between an incident particle and the surface, etc. Our knowledge of these processes, however, is only fragmentary. This is partly due to the difficulty in adequately controlling the ex perimental conditions. Consequently, until recently the data were usually so complex that reliable information about a particular elementary process could not be deduced. Within the last five to ten years, however, the techniques of ultra-high vacuum and surface preparation have developed rapidly and there has been a booming and widespread interest in the role of gas/solid interactions in such diverse fields as plasma physics, thermonuclear reactions, thermionic energy conversion, ion propulsion, sputtering corrosion of the surface of satellites and ion engines, ion getter pumps, deposition of thin films, etc. This led to extensive investigations of numerous gas/solid phenomena, such as surface ionization, sputtering, emission of secondary electrons and ions from surfaces under atom and/or ion impact, ion neutralization, and the thermal accomodation of gaseous particles on surfaces. As a result, it has become possible to gather a variety of valuable information.
The report presents the results of the past year's work in a program to investigate basic process in thermionic diodes which are important to the realization of practical thermionic energy conversion.
It is widely recognized that an understanding of the physical and chemical properties of clusters will give a great deal of important information relevant to surface and bulk properties of condensed matter. This relevance of clusters for condensed matter is one of the major motivations for the study of atomic and molecular clusters. The changes of properties with cluster size, from small clusters containing only a few atoms to large clusters containing tens of thousands of atoms, provides a unique way to understand and to control the development of bulk properties as separated units are brought together to form an extended system. Another important use of clusters is as theoretical models of surfaces and bulk materials. The electronic wavefunctions for these cluster models have special advantages for understanding, in particular, the local properties of condensed matter. The cluster wavefunctions, obtained with molecular orbital theory, make it possible to relate chemical concepts developed to describe chemical bonds in molecules to the very closely related chemical bonding at the surface and in the bulk of condensed matter. The applications of clusters to phenomena in condensed matter is a cross-disciplinary activity which requires the interaction and collaboration of researchers in traditionally separate areas. For example, it is necessary to bring together workers whose background and expertise is molecular chemistry with those whose background is solid state physics. It is also necessary to bring together experimentalists and theoreticians.
Superhalogens and Superalkalis is a comprehensive volume designed as the go-to resource on the exciting and evolving topics of these special classes of atomic clusters and the acid salt that results from their interactions. The book details how these substances possess not only unusual structures but also unique properties which can be exploited for various applications. Superhalogens’ strong oxidizing capacity, resulting from their high-electron affinity, leads to their applications in the design of superacids, organic superconductors, and ionic liquids. The low ionization energy of superalkalis enables them to act as strong reducing agents, making them useful in the design of superbases and alkalides. Illustrated throughout, this timely book provides an overview of the research and development on these and other aspects of superhalogen and superalkalis. Key features: Offers a basic introduction of superatoms that is accessible for readers to understand Includes extensive study questions after each chapter Provides a systematic presentation of the existing literature on this increasingly trending topic Presents the latest developments in the field, offering readers state-of-art knowledge This book is a key reference guide for graduate students, postdocs, upper-level undergraduate students, academic professionals, and researchers who are interested in this fascinating topic.
Particle separation from hot gases is a challenging task, especially for nanoparticles. Therefore, it is usually avoided by quenching the hot gas to conduct particle separation at a more convenient temperature. In these cases, valuable high-caloric heat is either not utilized at all or only inefficiently because of particle deposition on the heat exchanger surfaces. Valuable potential is thus wasted, as high-temperature processes are already an essential part of many industries and become increasingly relevant for other industrial sectors (e.g., pyrolytic processes in the circular economy). To reduce operating costs and environmental impact, the efficient use of resources (especially fossil fuels) is an absolute necessity. To tackle this pending problem, the concept of high-temperature electrostatic precipitation is investigated in this doctoral thesis. In an electrostatic precipitator, particles are charged by charge carriers produced in a corona discharge near the discharge electrode. Charged particles migrate due to the electric field and subsequently precipitate onto the collection electrode. This doctoral thesis clearly demonstrates the feasibility of nanoparticle removal from hot gases at up to 1073 K (800 °C) using electrostatic precipitation while presenting novel insights into the charge carrier properties and their distribution, the influence of thermionic emission on the operation of electrostatic precipitators, and the fundamentals of particle charging at high temperatures.