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Seminar Abstract(Scanning) Transmission Electron Microscopy with High Spatial, Temporal and Spectroscopic ResolutionUniversity of California - Davis Thursday, October 15th 1:25 PM The last few years have seen a paradigm change in (scanning) transmission electron microscopy with unprecedented improvements in spatial, spectroscopic and temporal resolution being realized by aberration correctors, monochromators and pulsed photoemission sources. Spatial resolution now extends to the sub-angstrom level, spectroscopic resolution into the sub-100meV regime and temporal resolution to the nanosecond scale. However, while these instrumentation developments have brought notable successes in materials analysis, they have also challenged the established experimental protocols and our fundamental understanding of both imaging and spectroscopy in the (S)TEM. In this presentation, examples of where the new instrumentation has successfully been used to address materials issues in nanoscale systems will be described. Additionally, the challenges associated with the routine use of the new (S)TEMs for reliable quantitative imaging and spectroscopy will be discussed. Finally, a personal perspective on the technology that will shape (S)TEM capabilities in the next few years will be presented. This work was performed in part under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory and supported by the Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, of the U.S. Department of Energy under Contract DE-AC52-07NA27344. This work was also supported in part by U.S. Department of Energy grant numbers DE-FG02-03ER46057 and DE-FG52-06NA26213, National Science Foundation grant numbers CTS-0500511 and DMR-04557660, by NIH grant number RR025032-01 and by ExxonMobil. |
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