Resonant Positron Annihilation on Molecules

摘要：

At incident positron energies below the threshold for positronium atom formation, there are many cases in which annihilation rates for molecules are far in excess of that possible on the basis of simple two-body collisions. We now understand that this phenomenon is due to positron attachment to molecules mediated by vibrational Feshbach resonances. The attachment enhances greatly the overlap of the positron with molecular electrons and hence increases the probability annihilation. Furthermore, measurements of the annihilation spectra as a function of incident positron energy provide a means of measuring positron-molecule binding energies. In this paper we present an overview of our current understanding of this process, highlighting key results and discussing outstanding issues that remain to be explained.

关键词： antimatter positron-molecule interactions Feshbach resonances

作者: J.A.Young C.M.Surko

作者单位: Department of Physics,University of California San Diego,La Jolla CA 92093 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: 9-16

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）