Analytical SuperSTEM for extraterrestrial materials research

Bradley, J P; Dai, Z R

doi:10.1111/j.1945-5100.2009.tb01195.x

Title: Analytical SuperSTEM for extraterrestrial materials research

Journal Article · Tue Sep 08 00:00:00 EDT 2009 · Meteoritics and Planetary Science, vol. 44, no. 10, September 1, 2009, pp. 1627-1642

DOI:https://doi.org/10.1111/j.1945-5100.2009.tb01195.x· OSTI ID:985489

Bradley, J P; Dai, Z R

Electron-beam studies of extraterrestrial materials with significantly improved spatial resolution, energy resolution and sensitivity are enabled using a 300 keV SuperSTEM scanning transmission electron microscope with a monochromator and two spherical aberration correctors. The improved technical capabilities enable analyses previously not possible. Mineral structures can be directly imaged and analyzed with single-atomic-column resolution, liquids and implanted gases can be detected, and UV-VIS optical properties can be measured. Detection limits for minor/trace elements in thin (<100 nm thick) specimens are improved such that quantitative measurements of some extend to the sub-500 ppm level. Electron energy-loss spectroscopy (EELS) can be carried out with 0.10-0.20 eV energy resolution and atomic-scale spatial resolution such that variations in oxidation state from one atomic column to another can be detected. Petrographic mapping is extended down to the atomic scale using energy-dispersive x-ray spectroscopy (EDS) and energy-filtered transmission electron microscopy (EFTEM) imaging. Technical capabilities and examples of the applications of SuperSTEM to extraterrestrial materials are presented, including the UV spectral properties and organic carbon K-edge fine structure of carbonaceous matter in interplanetary dust particles (IDPs), x-ray elemental maps showing the nanometer-scale distribution of carbon within GEMS (glass with embedded metal and sulfides), the first detection and quantification of trace Ti in GEMS using EDS, and detection of molecular H{sub 2}O in vesicles and implanted H{sub 2} and He in irradiated mineral and glass grains.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: W-7405-ENG-48

OSTI ID:: 985489

Report Number(s):: LLNL-JRNL-416911; TRN: US201016%%2024

Journal Information:: Meteoritics and Planetary Science, vol. 44, no. 10, September 1, 2009, pp. 1627-1642, Vol. 44, Issue 10

Country of Publication:: United States

Language:: English

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Title: Analytical SuperSTEM for extraterrestrial materials research

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