Atomic-Resolution Studies of Materials by Abberation-Corrected Scanning Transmission Electron Microscopy

03 Mar2016

Speaker: Ondrej L. Krivanek, Arizona State University

Time: March 3, 2016, 2:00 - 3:00

Location:

Hennings 318
6224 Agricultural Rd
Vancouver, BC V6T 1Z1
Canada

Aberration-corrected scanning transmission electron microscopes (STEMs) are now able to form electron probes as small as 0.5 Å in diameter, and they can image and spectroscopically analyze single atoms in-situ. Nion Co., has pioneered these advances, by developing the first aberration corrector that improved spatial resolution of an electron microscope to better than 1 Å, and later on by developing a new STEM that can acquire images and high quality spectra from single atoms in many different types of materials. More recently, we have introduced a monochromated STEM system for electron energy loss spectroscopy (EELS), which has made vibrational spectroscopy possible at an energy resolution better than 10 meV, and a spatial resolution of a few nm.

This seminar will review the basic principles behind the new developments, illustrate them with experimental results from a variety of materials, and discuss and illustrate especially inviting future directions.

  • Seminar
  • Student