Study of Coincidence Doppler Broadening in Carbon Nanotubes  

作　　者：郭卫锋 郝颖萍 成斌 刘建党 杜淮江 翁惠民 叶邦角 

机构地区：[1]Department of Modern Physics,University of Science and Technology of China [2]Department of Physics,Artillery Academy of PLA

出　　处：《Plasma Science and Technology》2012年第5期431-433,共3页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China (No.10835006)

摘　　要：Coincidence Doppler broadening measurements of positron annihilation for multi- walled carbon nanotubes, double-walled carbon nanotubes, single-walled carbon nanotubes and graphite were performed. The ratio curves of the Doppler broadening for these samples to silicon were obtained. It is shown that there are distinct peaks at the position of 10xl0-arn0c for both carbon nanotubes and graphite, however the amplitudes of the peaks are not the same. We have the opinion that these peaks arise from the annihilation of positron with the 2s and 2p electron of carbon element.Coincidence Doppler broadening measurements of positron annihilation for multi- walled carbon nanotubes, double-walled carbon nanotubes, single-walled carbon nanotubes and graphite were performed. The ratio curves of the Doppler broadening for these samples to silicon were obtained. It is shown that there are distinct peaks at the position of 10xl0-arn0c for both carbon nanotubes and graphite, however the amplitudes of the peaks are not the same. We have the opinion that these peaks arise from the annihilation of positron with the 2s and 2p electron of carbon element.

关 键 词：positron annihilation coincidence Doppler broadening carbon nanotubes 

分 类 号：O572.322[理学—粒子物理与原子核物理] TB383.1[理学—物理]