CONTRIBUTIONS OF RITCHIE,R.H. TO THE UNDERSTANDING OF CHARGED-PARTICLE PENETRATION PHENOMENA

Contributions of R.H. Ritchie to the understanding of phenomena associ ated with the penetration of charged particles in condensed matter are reviewed. Ritchie was the first to predict the existence of the surfa ce plasmon and to suggest how it might be observed experimentally, and has since made many contributions related to it. He pioneered in deve loping theoretical concepts and methods in numerous other areas includ ing energy loss of charged particles, transport theory, nonlinear resp onse of solids, the charged-particle wake, stopping power for slow ion s, self-energy of slow electrons, and theoretical electron microscopy. Other trailblazing work of his, including various aspects of radiatio n dosimetry, and instrument theory and design, are discussed briefly.