Development of pressure-modulated EXAFS method

Many modulation techniques have been widely applied to improve the quality of conventional spectra. Here a pressure-modulated EXAFS method is proposed to detect the small changes of local structure induced by the modulation of high pressure. In the experiment a dynamic diamond anvil cell was used to...

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Published inChinese physics C Vol. 36; no. 2; pp. 184 - 187
Main Author 储胜启 郑黎荣 车容钲 周爱玉 张静 刘景 胡天斗
Format Journal Article
LanguageEnglish
Published 01.02.2012
Subjects
Amplifiers
Atomic structure
Diamond anvil cells
Displacement
Dynamics
EXAFS
Loads (forces)
Modulation
Spectra
ZnSe
光谱质量
压力
局部结构
调制技术
调制方法
锁定放大器
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ISSN1674-1137
0254-3052
DOI10.1088/1674-1137/36/2/015

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Summary:Many modulation techniques have been widely applied to improve the quality of conventional spectra. Here a pressure-modulated EXAFS method is proposed to detect the small changes of local structure induced by the modulation of high pressure. In the experiment a dynamic diamond anvil cell was used to put a periodic load on the sample and lock-in amplifier to measure the modulated EXAFS signals. We have applied this technique to ZnSe and revealed a sensitivity to atomic displacement of 0.1 pm that is about ten times better than that of traditional EXAFS.
Bibliography:Many modulation techniques have been widely applied to improve the quality of conventional spectra. Here a pressure-modulated EXAFS method is proposed to detect the small changes of local structure induced by the modulation of high pressure. In the experiment a dynamic diamond anvil cell was used to put a periodic load on the sample and lock-in amplifier to measure the modulated EXAFS signals. We have applied this technique to ZnSe and revealed a sensitivity to atomic displacement of 0.1 pm that is about ten times better than that of traditional EXAFS.
11-5641/O4
modulated EXAFS, modulation, high pressure, dynamic DAC
CHU Sheng-Qi ZHENG Li-Rong CHE Rong-Zheng ZHOU Ai-Yu ZHANG Jing LIU Jing HU Tian-Dou 1 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China
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ISSN:1674-1137
0254-3052
DOI:10.1088/1674-1137/36/2/015