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Recent advances in the study of solid surfaces and thin films using variable-energy positron beams are reviewed. In the first part the authors discuss the process of positron moderation and technical… (More)
A well-annealed W(110) single crystal was used as a fast-to-slow positron moderator. The measured moderator efficiency at room temperature using a58Co positron source in the backscattering geometry… (More)
Abstract We have measured the total γ-activity and the emitted positron yields from two commercial 22 Na sources (∼ 5 mCi and ∼ 70 mCi). For the weaker source, we find good agreement between the… (More)
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… (More)
This work presents a systematic study of the substrate temperature dependence for the formation of the photoluminescent W center during high energy self‐ion irradiation of silicon. All previous… (More)
Crystalline and amorphous ice were studied with monoenergetic positrons with incident energies 0 or approx. =17 A diameter) in amorphous ice.
Abstract Recent advances in the use of variable-energy positrons for studies of solid surfaces have led to the new technique of re-emitted positron spectroscopy (RPS). We present a RPS study of the… (More)
Over the last 10 years, positrons have been used as a tool to study and profile dilute concentrations of defects in solids. The two basic techniques involve the measurement of the positron lifetime...
The positron beam technique is shown to be a sensitive indicator of the presence of arsenic within the grain boundaries of poly-silicon. Variable-energy positron beam and secondary-ion mass… (More)