Ps2 production, utility and prospects for spectroscopic measurements

摘要：

Recently we have obtained experimental evidence for the production of molecular positronium (Ps2) in a porous silica film 1 and on an Al (111) surface 2 following the implantation of intense positron pulses 3. In this work the presence of Ps2 was inferred from changes in single-shot lifetime spectra 4 measured using different incident beam densities. When combined with variations in the sample temperature this methodology provides convincing evidence for Ps2 formation, and can even be used to study the formation mechanisms 5 and measure the binding energy 6 of the molecule. Nevertheless, information obtained from lifetime data is indirect, and it is desirable to perform a more direct, spectroscopic, measurement, which may be done via a resonant excitation of the bound 1S-2P molecular state 7.

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

作者单位: Department of Physics and Astronomy,University of California,Riverside,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: 7

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）