Development of a Positron Probe Microanalyzer for Analysis of Atomic Vacancy Distributions

Nagayasu Oshima and Ryoichi Suzuki

Abstract: Positron probe microanalyzer (PPMA) which is a positron lifetime measurement system using a pulsed slow-positron microbeam with a minimum diameter of 30 micrometers has been developed in AIST, with the intense slow-positron beam generated by an electron accelerator. Three dimensional distributions of atomic sized defects can be visually evaluated through positron lifetime mapping obtained by the PPMA.

Key words: positron probe microanalyzer, scanning positron microscope, slow positron, positron annihilation lifetime spectroscopy, atomic vacancy