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The trap based slow positron beam spectrometer is an instrument used to study the surface of matter. It utilizes the characteristics of slow positrons to measure the change of its charge state by putting the sample into the trap, so as to obtain the electronic structure information of the material surface. The instrument has the advantages of high resolution and high sensitivity, and is widely used in the research of materials science, surface chemistry and other fields. The project is used to study metal, semiconductor and polymer thin film materials, surface defects, free volume, and pore depth.
Q. What is the positron source used in the test?
A. 22Na is usually used as the positron source, and the source strength is several microcuries to tens of microcuries.
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