报告人: 陈宁 研究员
Staff Scientist, HXMA BL, Canadian Light Source
Adjunct Professor, Department of Geological Sciences,
University of Saskatchewan
题目：X-Ray Absorption Spectroscopy (XAS) in Nano Material Study XANES and EXAFS Modeling
地点：909号楼一楼D会议室 (Conference Room D, 909-1F)
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.
XAFS application in environmental, material, energy, mineralogy, geochemistry, and related sciences.
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.
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
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.