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Progress Towards Atomic-Scale Analytical Tomography

Friday October 28, 2022
3:30 pm

 Presenter:  Thomas F. Kelly, Steam Instruments, Inc.
 Series:  Physics and Astronomy Colloquium
 Abstract:  Atomic-Scale Analytical Tomography (ASAT) has been defined as the determination of the correct (isotopic) identity of every atom and its precise three-dimensional (3-D) location in a structure for large volumes (>106 nm3) of material. ASAT should also be able to determine the local electronic structure of these atoms which makes true 3-D atomic-structure / electronic-property relationships possible. No single technique that exists today has achieved or can achieve ASAT. However, combining transmission electron microscopy (TEM) and atom probe tomography with improved (100% quantum detection efficiency) detector technology has been identified as a path toward ASAT. Atom Probe Tomography (APT) provides mass spectral identification for each individual atom and atom positions; but lacks information about the specimen that limits the spatial resolution. The TEM provides precise information about the atom positions. This combination should achieve ASAT. As an illustration of ASAT’s promise, ASAT images of semiconductor nanostructures will reveal the 3-D position of individual dopant atoms with pm spatial resolution, the 3-D position of nuclear spin isotopes, nanometer-scale changes in strain due to structural defects and lattice mismatch, the 3-D position of point defects such as vacancies, and any electronic band structure changes at all these atomic-scale features. Within the next five years, it is expected that ASAT will be achieved through integration of 100% efficiency ion detectors, improved data handling algorithms, and integration of TEM and APT into a single instrument.
 Web Site:    https:/ / unm.zoom.us/ j/ 92709699696
 Host:  John Panitz
 Location:  PAIS-1100, PAIS

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