3-D image of defect structures measured using a positron microprobe

摘要：

We have developed a high efficiency slow positron beam based on the positron trapping technique1. A solid neon moderator was used in our system, which has much higher efficiency compared with the conventional tungsten moderator. The moderated slow positron beam is thermalized by collision with nitrogen gas molecules. The energy spread of positron beam is reduced from 1-2 eV to about 0.025 eV. The trapping efficiency of positron is as high as 20％. A rotating electric field was applied inside the trap to compress the beam size to about 1 mm.

作者: Z.Q.Chen Y.C.Wu S.J.Wang R.Greaves

作者单位: Department of Physics,Wuhan University,Wuhan 430072,P.R.China First Point Scientific Inc.,5330 Derry Avenue,Suite J,Agoura Hills,CA 91301,USA

会议类型: 国际会议

会议名称: 第九届国际正电子与正电子素国际会议(9th International Workshop on Positron and Positronium Chemistry)(PPC–9)

会议地点: 武汉

会议语种:英文

页码: 51

在线出版日期: 2008-05-11（万方平台首次上网日期，不代表论文的发表时间）