Nuclear Science and Techniques ›› 2019, Vol. 42 ›› Issue (4): 40103-040103.doi: 10.11889/j.0253-3219.2019.hjs.42.040103

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Design of soft X-ray photon correlation spectroscopy device

Sishi QU1,2,4,Zhi GUO1,3(),Renzhong TAI1,3(),Xiangzhi ZHANG1,3,Haigang LIU1,3,Huaina YU1,3   

  1. 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China)2(University of Chinese Academy of Sciences, Beijing 100049, China
    2. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China)4(ShanghaiTech University, Shanghai 201210, China
  • Received:2019-01-19 Revised:2019-02-23 Online:2019-04-10 Published:2019-04-18
  • Contact: Zhi GUO,Renzhong TAI E-mail:guozhi@sinap.ac.cn TAI Renzhong;guozhi@sinap.ac.cn;guozhi@sinap.ac.cn TAI Renzhong;tairenzhong@sinap.ac.cn
  • About author:<named-content content-type="corresp-name">QU Sishi</named-content>, female, born in 1995, graduated from Hubei University of Science and Technology in 2012, master student, focusing on nuclear energy science and engineering|<named-content content-type="corresp-name">QU Sishi</named-content>, female, born in 1995, graduated from Hubei University of Science and Technology in 2012, master student, focusing on nuclear energy science and engineering|GUO Zhi, E-mail: <email>guozhi@sinap.ac.cn TAI Renzhong</email>, E-mail: <email>tairenzhong@sinap.ac.cn</email>|GUO Zhi, E-mail: <email>guozhi@sinap.ac.cn TAI Renzhong</email>, E-mail: <email>tairenzhong@sinap.ac.cn</email>
  • Supported by:
    Supported by National Natural Science Foundation of China (No.11575284), the Key Projects of National Natural Science Foundation of China (No.51332002), the Key Projects of the Joint Fund for Scientific Research of Large Scientific Installations (No.U1732268), National Key R&D Program(No.2016YFB0700404)

Abstract: Background

X-ray photon correlation spectroscopy (XPCS) is a new technique for studying the small-scale relaxation dynamics of condensed matter by using the second order coherence of coherent X-ray scattering. It requires high coherence of incident light. The X-ray interference lithograph (XIL) beamline (BL08U) of Shanghai Synchrotron Radiation Facility (SSRF) uses elliptical polarization oscillator as light source, which has good coherence and high photon flux. It is suitable for the dynamics study of mesoscopic scale electrodes or magnetic micro-regions in ferroelectric and magnetic materials.

Purpose

This study aims to design a set of photon correlation spectroscopy equipment based on soft X-ray.

Methods

Soft X-ray from XIL of SSRF is used as coherent incident beam, and the secondary coherent light is collected, converted and amplified to perform autocorrelation operation. The effects of incident light energy and scattering angle on the scattering vector and period size of sample are discussed.

Results

When the spectral range is 90.5~93 eV and the hole diameter is 1 mm, the periodic scales of samples at different positions are 10~60 nm. The second-order correlation intensity function of detector arc region is deduced by using Gauss model, and it is used as a function of detection area, photon energy and time. The multiplicative noise of autocorrelation is suppressed by multilayer film polarization extinction.

Conclusion

The development of this device provides a technical approach for better analysis of material dynamics information, and is of great significance.

Key words: Soft X-ray, Photon correlation spectroscopy, Intensity correlation, Dynamics

CLC Number: 

  • O434.19,O4-34