Scientific Program

Research Techniques

X-Ray Microprobe, Spectroscopy & Microtomography

X-ray absorption fine structure (XAFS) probes the local atomic and chemical environment of a selected atomic species. By analyzing the modulations in the absorption coefficient at energies just above the x-ray absorption edge threshold, XAFS measurements give quantitative information about coordination species, number and distance. The x-ray absorption near-edge spectra (XANES) are also sensitive to the valence state of the probe atom.

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Interface, Surface Studies & Powder Diffraction

Surface and interface diffraction techniques are used to obtain fundamental knowledge on the structures of surfaces, how these surfaces are modified during hydroxylation and dehydroxylation processes, sorption reactions that occur on these surfaces and the role of biota in controlling the stabilization of toxins and contaminants on these surfaces.

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High Pressure / High Temperature Diamond Anvil Cell

The main goal of the diamond anvil cell program is to address geochemical and geophysical problems across the entire pressure- temperature range of the Earth and other terrestrial planets.

High pressure research using diamond anvil cells (DACs) provide access to the sample volume for x-rays as low as 15 keV, allowing powder and single crystal diffraction measurements to be made. These measurements will help to unravel the chemical and physical secrets of the deep Earth including phase transitions of mantle minerals and core alloys and dynamics of core formation.

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High Pressure / High Temperature Large Volume Press

The Large Volume Press (LVP) facilities hosts the following devices:

  • 1000 ton multi-function press at 13-ID-D
  • 250 ton multi-function press at 13-BM-D
  • 230 ton Paris-Edinburgh press at 16-BM-B of HPCAT

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Tomography

Tomographic imaging techniques are used to study the internal microstructures of complex materials. At GSECARS, computed microtomography is used to study a variety of geological samples. These range from the internal structures of precious samples like fossils, the distribution and location of inclusions in diamonds, the porosity and density of weathered rocks, studies of granular flow, and the transport of fluids such as water and oils in porous media.

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Scientific Contacts

 

Matt Newville

Microprobe

(630) 252-0431
newville@cars.uchicago.edu

Tony Lanzirotti

Microprobe

(630) 252-0433
lanzirotti@uchicago.edu

Steve Sutton

Microprobe

(630) 252-0426
sutton@cars.uchicago.edu

Peter Eng

Interface / Surface Studies and Powder Diffraction

(630) 252-0424
eng@cars.uchicago.edu

Joanne Stubbs

Interface / Surface Studies and Powder Diffraction

(630) 252-0427
stubbs@cars.uchicago.edu

Vitali Prakapenka

High Pressure / High Temperature Diamond Anvil Cell (DAC)

(630) 252-0439
prakapenka@cars.uchicago.edu

Sergey Tkachev

High Pressure / High Temperature Diamond Anvil Cell (DAC) Main Contact

(630) 252-0430
tkachev@cars.uchicago.edu

Yanbin Wang

Large Volume Press (LVP)

(630) 252-0425
wang@cars.uchicago.edu

Tony Yu

Large Volume Press (LVP)

(630) 252-6148
tyu@cars.uchicago.edu

Mark Rivers

Tomography

(630) 252-0422
rivers@cars.uchicago.edu