Detection of re-emission positrons on metal surfaces during slow positron measurements

14th International Workshop on Slow Positron Beam Techniques & Applications

Kinomura, A.^1 ; Suzuki, R.^2 ; Ogawa, H.^2 ; Oshima, N.^2 ; O'Rourke, B.E.^2 ; Yabuuchi, A.^1

Research Reactor Institute, Kyoto University, Kumatori-cho, Osaka

590-0494, Japan^1

National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki, Tsukuba

305-8568, Japan^2

关键词: Detection methods;    Ion beam irradiation;    Mesh electrodes;    Metal surfaces;    Positron annihilation lifetime spectroscopy;    Ring electrodes;    Trajectory calculations;    Uniform electric fields;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/791/1/012035/pdf
DOI  :  10.1088/1742-6596/791/1/012035

来源: IOP

【 摘 要 】

Detection methods for re-emitted positrons from Ni samples were investigated for in-situ positron annihilation lifetime spectroscopy during ion beam irradiation. A conventional mesh electrode and a ring electrode were examined to detect re-emitted positrons. Results of positron trajectory calculation were in good agreement with the experimental results on the mesh electrode. Simulation and experiments indicated that the ring electrode can form almost uniform electric fields in front of the sample and thus it can be used instead of the mesh electrode.