Several beam-solid interaction techniques have been developed that can either stand alone or be used in connection with others for materials processing, for fabrication of devices with enhanced electro-optical and mechanical properties, and with enhanced resistance to corrosion and erosion. For example, advances in focused ion beams (FIB) have brought out-of-reach ideas and applications to fruition. This book from MRS focuses on the developments in ion-beam-assisted processing of materials and reviews successful applications of the techniques. Topics include: fundamentals of ion-solid interactions; ion-beam mixing; radiation damage; insulators and wide bandgap materials; polymers; optical materials; plasma and ion-assisted techniques; metals and tribology; focused ion beams; fundamental semiconductor processing and compound semiconductors.