• atoms
  • Not only do we want to know what atoms are where, but what the electrons in those atoms are doing. (ecnmag.com)
  • 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)
  • An annular dark field image formed only by very high angle, incoherently scattered electrons (Rutherford scattered from the nucleus of the atoms) - as opposed to Bragg scattered electrons - is highly sensitive to variations in the atomic number of atoms in the sample (Z-contrast images). (wikipedia.org)
  • atomic
  • EELS tends to work best at relatively low atomic numbers, where the excitation edges tend to be sharp, well-defined, and at experimentally accessible energy losses (the signal being very weak beyond about 3 keV energy loss). (wikipedia.org)
  • The researchers were able to figure out the total number and distribution of electrons in atomic energy levels that determine the local magnetic moments. (ecnmag.com)
  • The research group was unaware of this publication until 1932, when they quickly realized that the De Broglie wavelength of electrons was many orders of magnitude smaller than that for light, theoretically allowing for imaging at atomic scales. (wikipedia.org)
  • 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)
  • detector
  • A position sensitive detector can detect the energy along one direction and depending on the additional optics lateral resolution or one angle along the other direction. (wikipedia.org)
  • These images are formed by collecting scattered electrons with an annular dark-field detector. (wikipedia.org)
  • aberration corrector
  • The addition of an aberration corrector to STEMs enables electron probes to be focused to sub-ångström diameters, allowing images with sub-ångström resolution to be acquired. (wikipedia.org)
  • phonon
  • However, due to the strong electron-phonon interaction in single-walled CNTs, it has been discovered that electronic current undergoes saturation at the voltage bias beyond 0.2 V. Nevertheless, CNTs with few nm in diameter are extremely robust compared with metallic nanowires of similar diameter and demonstrate conducting properties superior as compared with Cu. To make a connection, CNTs have to be paralleled in order to lower the resistance. (wikipedia.org)
  • 1995
  • 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)
  • Beside these activities, he was Honorary Professor at the Technical University of Berlin (1975-1995), Founding Editor of the Journal Ultramicroscopy with North-Holland Publishing Company (Elsevier), and Honorary Member in numerous international organizations about electron microscopy. (wikipedia.org)
  • inelastic electron
  • Non-fiction books Fundamentals of inelastic electron scattering. (wikipedia.org)
  • Dr. Leapman has devised new methods for quantifying both elemental and chemical information obtained from inelastic electron scattering, a research area in which he has over one hundred publications. (wikipedia.org)
  • electrostatic
  • Magnetic fields will act in a direction perpendicular to the electron propagation, thereby conserving velocity, whereas electrostatic fields will cause electrons to move along the field gradient, which may change electron energies if the component of the direction of propagation and field gradients are not perpendicular. (wikipedia.org)
  • particles
  • This time as well as covering the whole field, well defined electron collisions with clusters and with particles in the complex potential of a surface were emphasized. (eurobuch.com)
  • Not many details are known about such collisions, although they become more and more important in surface characterisation, plasma-wall interactions, electron induced desorption and reorganisation of adsorbed particles. (eurobuch.com)
  • biological
  • Leapman RD, Kocsis E, Zhang G, Talbot TL, Laquerriere P. Three-dimensional distributions of elements in biological samples by energy-filtered electron tomography. (wikipedia.org)
  • incident
  • There are several basic flavors of EELS, primarily classified by the geometry and by the kinetic energy of the incident electrons (typically measured in kiloelectron-volts, or keV). (wikipedia.org)
  • wavelength
  • In 1925, Louis de Broglie first theorized the wave-like properties of an electron, with a wavelength substantially smaller than visible light. (wikipedia.org)
  • particle
  • H R {\displaystyle H_{R}} causes the particle to spiral through the lens, and this spiraling expose the electron to H Z {\displaystyle H_{Z}} which in turn focus the electron. (wikipedia.org)
  • carbon
  • The resistance R of one single-walled carbon nanotube (SWCNT) can be expressed by R = Rc + Rq (1+L/Lmfp) where Rc is an extrinsic contact resistance, Rq is the quantum resistance (6.5 kΩ) which comes from the connection of 1D material to a 3D metal, L is the CNT length and Lmfp is the mean free path of the electron. (wikipedia.org)
  • This is approximately the amount of energy needed to remove an inner-shell electron from a carbon atom, which can be taken as evidence that there is a significant amount of carbon present in the sample. (wikipedia.org)
  • image
  • The energy slit can be adjusted so as to only allow electrons which have not lost energy to pass through to form the image. (wikipedia.org)
  • As the ionisation signal is often significantly smaller than the background signal, it is normally necessary to obtain more than one image at varying energies to remove the background effect. (wikipedia.org)
  • He also initiated the development and designed the first user interface of DigitalMicrograph, which went on to become the world's leading electron microscopy image acquisition and processing software. (wikipedia.org)
  • symposium
  • This volume contains the invited papers and selected contributed papers presented at the biennial International Symposium on ELECTRON COLLISIONS WITH MOLECULES, CLUSTERS AND SURF ACES held at Royal Holloway, University of London from 29th to 30th July, 1993. (eurobuch.com)
  • interfaces
  • Behaviors of functional interfaces are crucial factors in the performance and safety of energy storage and conversion devices. (amrita.edu)
  • Insights gained from this technique will shed light on important challenges of interfaces in all-solid-state energy storage and conversion systems and facilitate improved engineering of devices operated far from equilibrium. (amrita.edu)