The Free Positron Lifetime in Amorphous Polymer at low temperature

摘要：

Most of the PALS studies on amorphous polymers focus on the ortho-positronium component. This third component is of a great interest in material science compared to the others since it allows to estimate the free volume hole size using the well known Tao & Eldrup equation. Consequently free positron lifetime (τ2) and its relative intensity (I2) are hardly reported in the literature. The work focuses on the positron lifetime. PALS spectra of different amorphous polymers were recorded at 20 K for more than one week. The lifetime spectra are analyzed in three discrete components using LT9. An increase of the free positron annihilation lifetime with time is observed which follows the trend of I3.

作者: Nicolas LAFOREST Corine BAS Charles DAUWE Jérémie De BAERDEMAEKER

作者单位: LMOPS-UMR5041,Savoie Université,Campus Scientifique,73376 Le Bourget-du-lac Cedex,France NUMAT,Depar LMOPS-UMR5041,Savoie Université,Campus Scientifique,73376 Le Bourget-du-lac Cedex,France NUMAT,Department of Subatomic and Radiation Physics,Ghent University,Proefstuinstraat 86,9000 Ghent,

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: 22

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）