Abstract
One of the more active areas of research on materials involves the observation and characterization of defects. The discovery of positron localization in vacancy-type defects in solids in the 1960’s initiated a vast number of experimental and theoretical investigations which continue to this day. Traditional positron annihilation spectroscopic techniques, including lifetime studies, angular correlation, and Doppler broadening of annihilation radiation, are still being applied to new problems in the bulk properties of simple metals and their alloys. In addition, new techniques based on tunable sources of monoenergetic positron beams have, in the last five years, expanded the horizons to studies of surfaces, thin films, and interfaces. In the present paper, we briefly review these experimental techniques, illustrating them with some of the important accomplishments in the field.
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