Behaviors of d and f electrons in transition metals studied by positron annihilation

WEN Xinzhu WANG Yuxin CHEN Zhenying HUANG Yuyang DENG Wen

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Behaviors of d and f electrons in transition metals studied by positron annihilation

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- Behaviors of d and f electrons in transition metals studied by positron annihilation
- NUCLEAR TECHNIQUES Issue 1, (2008)
- 作者机构：
  
  1. 广西大学物理科学与工程技术学院
  2. 广西大学物理科学与工程技术学院,南宁,530004
- 作者简介：
- 基金信息：
  
  国家自然科学基金项目(50361002);广西研究生教育创新计划项目(2006105930702M15)资助
- DOI：
  CLC： TG111
- Published：01 January 2008
- 稿件说明：
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[1]温新竹,王宇鑫,陈真英,黄宇阳,邓文.过渡金属元素中d和f电子行为的正电子湮没研究[J].核技术,2008(01):50-52.

WEN Xinzhu WANG Yuxin CHEN Zhenying HUANG Yuyang DENG Wen. Behaviors of d and f electrons in transition metals studied by positron annihilation[J]. Nuclear techniques, 2008, (1): 50-52.
[1]温新竹,王宇鑫,陈真英,黄宇阳,邓文.过渡金属元素中d和f电子行为的正电子湮没研究[J].核技术,2008(01):50-52. DOI：

WEN Xinzhu WANG Yuxin CHEN Zhenying HUANG Yuyang DENG Wen. Behaviors of d and f electrons in transition metals studied by positron annihilation[J]. Nuclear techniques, 2008, (1): 50-52. DOI：

摘要

采用双探头符合技术

大幅度地降低了正电子湮没辐射Doppler展宽谱的本底

使谱线的峰高与本底之比高于10

从谱线的高能端提取正电子与过渡金属原子中d或f电子湮没的信息。测量了Zr、Nb、Mo、Ag、Hf、Pt、Au等纯金属和单晶Si样品的符合Doppler展宽谱

并以单晶Si样品为参考作出了这些金属的商谱。结果表明:金属Zr、Nb、Mo、Ag的商谱随原子的4d电子数目的增多而升高;金属Hf、Pt、Au的商谱出现了双峰

其峰高均随原子序数的增加而升高。

Abstract

The background of the spectrum of Doppler broadening of positron annihilation radiation can be reduced remarkably by using a two-detector coincidence technique.With this setup

we get a peak to background ratio of about 104 on the high energy side of the peak.The d electron and f electron signal for the transition metals can be extracted from the coincidence Doppler broadening spectrum.The coincidence Doppler broadening spectra for the transition metals Zr

Au and single crystal of Si have been measured.The experimental results show that the height of the peak of the ratio curves(the reference sample is Si)for the transition metals Zr

Ag increases with the increase in the number of 4d electrons.There are 2 peaks in the ratio curves(the reference sam- ple is Si)for the transition metals Ag

Pt.And the height of the peaks increases with the increase in atomic num- ber.

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