| 碳纳米管束中的正电子理论 |
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| 引用本文： | 陈祥磊,郗传英,叶邦角,翁惠民. 碳纳米管束中的正电子理论[J]. 物理学报, 2007, 56(11): 6695-6700 |
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| 作者姓名： | 陈祥磊 郗传英 叶邦角 翁惠民 |
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| 作者单位： | 中国科学技术大学近代物理系,合肥,230026 |
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| 摘 要： | 采用中性原子叠加模型和有限差分方法(SNA-FD)计算了大范围内不同管径的单壁碳纳米管束中的正电子情况，发现对于单壁碳纳米管束，正电子的主要湮没区域，湮没对象和正电子寿命随碳纳米管管径的不同而发生规律性变化.计算得到管径范围在0.8—1.6nm的碳纳米管束的正电子寿命范围为332—470ps，与实验测得的394ps符合较好.
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| 关 键 词： | 局域密度近似 单壁碳纳米管 正电子寿命 |
| 文章编号： | 1000-3290/2007/56(11)/6695-06 |
| 收稿时间： | 2007-03-16 |
| 修稿时间： | 2007-04-04 |
Analysis of positron annihilation lifetime in single-walled carbon nanotube bundles |
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| Chen Xiang-Lei,Xi Chuan-Ying,Ye Bang-Jiao,Weng Hui-Min. Analysis of positron annihilation lifetime in single-walled carbon nanotube bundles[J]. Acta Physica Sinica, 2007, 56(11): 6695-6700 |
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| Authors: | Chen Xiang-Lei Xi Chuan-Ying Ye Bang-Jiao Weng Hui-Min |
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| Affiliation: | Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China |
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| Abstract: | Superposed-neutral-atom model and the finite-difference method (SNA-FD) is used to calculate the positron annihilation lifetime in single-walled carbon nanotube bundles with different diameters in a large range. We find that in single-walled carbon nanotube bundles，the main area where positron annihilation takes place，the main object that positron annihilates with, as well as the positron annihilation lifetime change regularly as the diameter of single-walled carbon nanotube bundles changes. The positron annihilation lifetime in single-walled carbon nanotube bundles with diameter between 0.8—1.6nm is calculated to be 332—470ps. It agrees well with the experimental result of 394ps. |
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| Keywords: | local density approximation single-walled carbon nanotube positron lifetime |
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