Other Research Interests

I work closely with Dr. Peter Williams  in order to improve NanoSIMS instrumentation, e.g., we tested a new cesium ion source design on our NanoSIMS that has tiny 25nm spot sizes. We have a patent on this source design.

I have developed key measurement protocols for nanoscale imaging and high-precision isotopic data using the NanoSIMS. I have considerable experience in a variety of other NanoSIMS applications in collaboration with ASU faculty and researchers elsewhere.

Geochemistry

  • Lithium diffusion in zircons
  • Aluminum contents in experimental zircons
  • Rare earth element diffusion in pyroxenes, sanidines, zircons

Environmental

  • Elemental and isotopic heterogeneities in foram shells
  • Sulfur isotopes in individual aerosol particles

Microbiology

  • Carbon isotopic labeling of cyanobacteria boring into calcite and dolomite
  • Labeled ciliate (bacteria) and prymnesium (flagellated algae) to understand nutrient intake
  • Trace Element Reconnaissance study on black oil shale
  • Clay-microbial interactions using trace metals
  • Nitrogen isotopic labeling of microbes in extreme environments, e.g., the hotsprings in Yellowstone National Park
  • Carbon and nitrogen isotope labeling to understand the formation of thylakoid membranes in cyanobacteria

Material Science

  • Characterization of materials  such as doped Si wafers and textured solar cells
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