Positron Re-emission Studies from W (100)

16th International Conference on Positron Annihilation

Sudarshan, K.^1 ; Petrov, V.N.^1,2 ; Samarin, S.N.^1 ; Guagliardo, P.^1 ; Weiss, A.H.^3 ; Williams, J.F.^1

ARC Centre of Excellence for Antimatter and Matter Studies, School of Physics, University of Western Australia, Crawley, Perth, WA 6009, Australia^1

St. Petersburg State Polytechnical University, Polytechnicheskaya 29, St.-Petersburg 195251, Russia^2

Physics Department, University of Texas at Arlington, Arlington, TX 76019-0059, United States^3

关键词: Energy ranges;    Low-energy;    Positron beams;    Re-emission;    Sample temperature;    Surface cleanliness;    Western Australia;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/443/1/012070/pdf
DOI  :  10.1088/1742-6596/443/1/012070

来源: IOP

【 摘 要 】

A tunable low energy positron beam has been established at The University of Western Australia. The positron beam can deliver approximately 700 positrons per second in the energy range of 0-1 keV. Initial studies of thermal positron re-emission from a W(100) target showed that the positron work function was 2.75 ± 0.01eV. It was also found that the positron reemission yield was sensitive to the sample temperature and surface cleanliness.