Canadian Light Source(加拿大光源)陈宁研究员10月18日下午报

发布时间:2013-10-16访问量:144设置

报告人: 陈宁 研究员

                                   Staff Scientist, HXMA BL, Canadian Light Source

      Adjunct Professor, Department of Geological Sciences,

       University of Saskatchewan

      ning.chen@lightsource.ca

 

题目X-Ray Absorption Spectroscopy (XAS) in Nano Material Study XANES and EXAFS Modeling

 

时间:20131018(星期五)下午14:00

地点:909号楼一楼D会议室 (Conference Room D, 909-1F)

 

摘要:

X-ray absorption spectroscopy (XAS) is an element specific structure technique, including X-ray absorption fine structure (EXAFS) and X-ray Absorption Near Edge Structure (XANES). Both techniques have been widely used in the study for nano materials and nano scale domains of materials in mineralogy, chemistry, environmental science, and material science from element local geometric and/or electronic structure perspectives. In this talk, discussion will be made regarding XAS casestudies, including site occupancy (As3+/As5+ in colemanite), “space group” determination (amorphous CdS materials), local structure related finger print feature (U6+), and nano particle dimension (annabergite, Ni3(AsO4)2·8H2O). Theoretical modeling, especially XANES calculation, has been used in these study cases, indicating a new approach in XAS study.

These XAS studies can be performed at the Hard X-ray Micro-Analysis (HXMA) beamline 06ID-1 at the Canada Light source (CLS), a wiggler-sourced hard X-ray (5–40 keV) spectroscopy facility with capabilities of XAFS, diffraction, and microprobe. At HXMA from XAS perspective, except the usual experimental user support at beamline, the unique support capability regarding the XANES(FDMNES)/EXAFS(FEFF) theoretical modeling is also available.

 

 

个人简介:

 

RESEARCH

XAFS application in environmental, material, energy, mineralogy, geochemistry, and related sciences.

 

EDUCATION

1996 - 2001 Ph. D

Department of Geological Sciences, University of Saskatchewan, Canada (EPR

studies on REE in minerals)

Thesis title: Electron paramagnetic resonance spectroscopic study of local structural environment and substitution mechanism of gadolinium at calcium sites in synthetic fluorapatite.

1986 – 1989 M. Sc

Beijing Institute of Environmental Features, former Ministry of Aerospace Industry,

PRC. (Photoelectrical Technology & Remote Sensing)

Thesis title: The characteristics of short-wave reflected infrared spectra of hydrothermal alteration minerals and rocks and its application to gold deposits.

1979 – 1983 B. Sc.

Department of Optics, Shandong University, PRC (Infrared Optics)

Thesis title: The design of the large band-width preamplifier for PbSnTe and HgCdTe sensors.

 

WORK EXPERIENCE

2003- present      Staff Scientist, Canadian Light Source.

2003- present      Adjunct Professor, Department of Geological Sciences, University of Saskatchewan.

2001- 2003          Postdoctoral fellowship and COGEMA Research Associate, Canadian Light Source.

1996- 2001          Teaching Assistant & Research Assistant, Department of Geological Sciences,University of

                          Saskatchewan.

1989- 1996          Engineer, Centre for Remote Sensing in Geology (CRSG), Ministry of Geology and Mineral Resources (MGMR), PRC.

1983- 1986          Assistant Engineer, CRSG, MGMR, PRC.

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