• beam of high-energy electrons
  • If a very thin sample is illuminated with a beam of high-energy electrons, then a majority of the electrons will pass unhindered through the sample but some will interact with the sample, being scattered elastically or inelastically (phonon scattering, plasmon scattering or inner shell ionisation). (wikipedia.org)
  • In a TEM, a thin crystalline specimen is subjected to a parallel beam of high-energy electrons. (wikipedia.org)
  • spectroscopic
  • CS1 maint: Extra text: authors list (link) F. Hofer, P. Warbichler and W. Grogger, Imaging of nanometer-sized precipitates in solids by electron spectroscopic imaging, Ultramicroscopy, Volume 59, Issues 1-4, July 1995, Pages 15-31. (wikipedia.org)
  • atoms
  • Crewe and coworkers at the University of Chicago developed the cold field emission electron source and built a STEM able to visualize single heavy atoms on thin carbon substrates. (wikipedia.org)
  • To circumvent this problem, the DNA bases can be labeled with heavier atoms (higher Z). Each nucleotide is tagged with a characteristic heavy label, so that they can be distinguished in the transmission electron micrograph. (wikipedia.org)
  • After fullerenes containing reactants diffuse into an SWNT, a high-energy electron beam can be used to displace carbon atoms and induce high reactivity, thus triggering formation of C60 dimers and merging of their contents. (wikipedia.org)
  • STEM
  • Directly interpretable Z-contrast imaging makes STEM imaging with a high-angle detector an appealing technique in contrast to conventional high resolution electron microscopy, in which phase-contrast effects mean that atomic resolution images must be compared to simulations to aid interpretation. (wikipedia.org)
  • differential
  • At lower magnifications TEM image contrast is due to differential absorption of electrons by the material due to differences in composition or thickness of the material. (wikipedia.org)
  • nanoscale
  • Electron tomography in materials science has flourished with the demand to characterize nanoscale materials in three dimensions (3D). (osti.gov)
  • Possible applications of nano-peapods include nanoscale lasers, single electron transistors, spin-qubit arrays for quantum computing, nanopipettes, and data storage devices thanks to the memory effects and superconductivity of nano-peapods. (wikipedia.org)
  • Imaging
  • Alternate modes of use allow for the TEM to observe modulations in chemical identity, crystal orientation, electronic structure and sample induced electron phase shift as well as the regular absorption based imaging. (wikipedia.org)
  • Each imaging electron interacts independently with the sample. (wikipedia.org)
  • ASIC-Based Event-Driven 2D Digital Electron Counter for TEM Imaging. (wikipedia.org)
  • substrate
  • Pole figures and electron back-scatter diffraction orientation maps indicate that both layers in the as-deposited state are single-crystalline with a cube-on-cube epitaxial relationship with the substrate. (diva-portal.org)
  • crystalline
  • The single-crystalline structure of the TiN layer is stable up to annealing temperatures of 1000 degrees C as shown by high resolution transmission electron microscopy. (diva-portal.org)
  • As a result of the interaction with a crystalline sample, the electron exit wave right below the sample φe(x,u) as a function of the spatial coordinate x is a superposition of a plane wave and a multitude of diffracted beams with different in plane spatial frequencies u (spatial frequencies correspond to scattering angles, or distances of rays from the optical axis in a diffraction plane). (wikipedia.org)
  • characteristics
  • Owing to the large number of highly curved fullerene surfaces acting as electron emission sites on conductive carbon nanotubes, nanobuds possess advantageous field electron emission characteristics. (wikipedia.org)
  • incident
  • In annular dark-field mode, images are formed by fore-scattered electrons incident on an annular detector, which lies outside of the path of the directly transmitted beam. (wikipedia.org)
  • Above the sample, the wave of an electron can be approximated as a plane wave incident on the sample surface. (wikipedia.org)
  • study
  • Preferential propagation of pores during the formation of porous silicon: A transmission electron microscopy study. (ebscohost.com)
  • In this study, we have evaluated the resolution of images obtained at 60 kV by TEM performed with a monochromated electron source. (osti.gov)
  • Negative staining transmission electron microscopy has also been successfully employed for study and identification of aqueous lipid aggregates like lamellar liposomes (le), inverted spherical micelles (M) and inverted hexagonal HII cylindrical (H) phases (see figure above). (wikipedia.org)
  • The study shows that electrons indeed pass to the neck and bud region of the nanobud system. (wikipedia.org)
  • sample
  • Remember, electrons must pass through the sample to generate an image. (coursera.org)
  • However, a large part of the structure information of the sample is contained in the phase of the electron wave. (wikipedia.org)
  • The interaction of the electron wave with the crystallographic structure of the sample is complex, but a qualitative idea of the interaction can readily be obtained. (wikipedia.org)
  • If the electron beam emerging from the sample is passed through a magnetic prism, then the flight path of the electrons will vary depending on their energy. (wikipedia.org)
  • Carter
  • International Federation of Societies for Microscopy (IFSM) Contact Page MSE Professor C. Barry Carter Awarded Ceramic Educational Council Outstanding Educator Award for 2014 World Premier International Research center Initiative Progress Report "Dr. Barry Carter to Receive Distinguished Scientist Award. (wikipedia.org)
  • energy
  • R.A. Bonham and M. Fink, High Energy Electron Scattering (Van Nostrand Reinhold, New York, 1983). (springer.com)
  • For a low accelerating voltage, linear information transfer, which determines the resolution for observation of single-layered materials, is largely limited by defocus spread, which improves when a narrow energy spread is used in the electron source. (osti.gov)
  • Adjusting the slit to only allow electrons which have lost a specific amount of energy can be used to obtain elementally sensitive images. (wikipedia.org)
  • however
  • However, at the time the results were inferior to those of transmission electron microscopy, and von Ardenne only spent two years working on the problem. (wikipedia.org)
  • For example, in 2012 a collaboration between scientists at Harvard University, the University of New Hampshire and ZS Genetics demonstrated the ability to read long sequences of DNA using the technique, however transmission electron microscopy DNA sequencing technology is still far from being commercially available. (wikipedia.org)
  • Show
  • Reported test measurements show (macroscopic) field thresholds of about 0.65 V/μm, (non-functionalized single-walled carbon nanotubes have a macroscopic field threshold for field electron emission ~2 V/μm) and a much higher current density as compared with that of the corresponding pure single-walled carbon nanotubes. (wikipedia.org)