Positronium molecule formation at an Al (111) Surface

摘要：

A single crystal Al(111) sample cleaned by repeated cycles of ion bombardment and annealing was irradiated by a subnanosecond high density positron beam 1 and the resulting positronium lifetime spectra were measured using single shot positron annihilation lifetime spectroscopy (SSPALS) 2. We observed a variation in the amount of positronium emitted when the incident positron beam density was varied, which indicates the formation of positronium molecule (Ps2) at the Al (111) surface 3. The Ps2 formation probability appears to be extremely sensitive to surface contamination and further experiments under improved vacuum conditions are planned to clarify this effect.

作者: S.H.M.Deng D.B.Cassidy A.P.Mills,Jr

作者单位: Department of Physics and Astronomy,University of California,Riverside,CA 92506,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: 109

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）