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.