The Mobility And Recombination Of Positive Rare Gas Ions

This final report describes briefly (a) a microwave system for measuring the electron density in decaying plasmas over t density range of about five thousand, (b) an experimental tube for measuring the value of the mobility of positive ions by means of the transit-time method, and (c) the results obtained during the period of the contract. The studies were confined to the rare gas ions and excellent agreement was found between the value of the mobility of atomic and molecular ions as determined from ambipolar diffusion coefficient measurements and those found by means of the ion transit-time method. The influence of the presence of negative ions on the ambipolar diffusion coefficient of electrons was demonstrated. The recombination coefficients of molecular neon and molecular argon ions were found to be independent of pressure and the values were in excellent agreement with previous studies. (Author).

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Electronic Excitations in Liquefied Rare Gases is a unique and only reference source that reviews the research and development of liquefied rare gases, which took place over a period of last 50 years. Liquefied rare gases are the simplest dielectric liquids, which are insulators from a physical point of view. While the gaseous and solid state of matter have received intensive attention from the begining of modern science, the knowledge about liquids remained undocumented so far. Liquids exhibit local order as solids and long-range disorder as gases. Fundamental problems related to the generation, transport and recombination of charge carriers in liquefied rare gases could be studied under controlled conditions since liquid samples of extremely high purity can be prepared. Liquefied rare gases have found applications in physics, chemistry, electrical engineering, and materials science. In this volume, world-leading scientists have summarized the knowledge gained about electronic processes in these liquids. The topics are interesting for scientists working in fundamental research as well for those applying liquefied rare gases in experimental or technical devices. The book contains 15 review chapters on different aspects of liquefied rare gases. Such an in depth compilations of knowledge in this field has not been published as of today. The topics of this book concentrate on the processes of electronic excitation, which are of general fundamental interest and have found applications in detectors for high energy physics, light sources for the extreme ultraviolet, etc. just to name a few.

This workshop on the subject of positron and positronium chemistry is the third international conference after those in Blacksburg, Virginia (1979), and in Arlington, Texas (1986). The fields of interests are interdisciplinary, such as radiation chemistry, superconductivity polymer chemistry, biochemistry, quantum chemistry and nuclear chemistry.