Study of porous silicon by positron age-momentum correlation

摘要：

Positron and positronium annihilation investigations were applied to study porous silicon (PS) made by anodization of crystal silicon in HF acid by means of a positron age-momentum correlation (AMOC) technique. Distinct electron momentum distributions were observed from para-Positroniums (p-Ps), free positrons and ortho-Positroniums (o-Ps) pick-off annihilation. The measurements of PS in different gas ambient (N2, Ar, O2) indicated that positronium atoms frequently collided with paramagnetic oxygen molecules in pores and o-Ps were effectively converted into p-Ps. Therefore, o-Ps lifetime decreases but Doppler broadening spectrum is narrowed.

作者: D.N.Wang L.Z.Zhang R.S.Yu B.Y.Wang L.Wei

作者单位: Key Laboratory of Nuclear Analysis Techniques,Institute of High Energy Physics,Chinese Academy of Sc Key Laboratory of Nuclear Analysis Techniques,Institute of High Energy Physics,Chinese Academy of Sc

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: 113

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）