Beyond the Scope: CEMAS Discussion Series

Join Peter Rez, a professor at Arizona State University, for our Beyond the Scope: CEMAS Discussion Series. Dr. Rez's background is in the theory of electron scattering as applied to electron microscopy and analysis. In particular, he has been involved with the development of electron energy loss spectroscopy (EELS) as a technique for not only mapping the composition of materials, but also studying electronic structure and bonding at near atomic resolution. 

CEMAS will offer this session both virtually and in person. Please indicate if you're planning to attend in person when prompted during registration. You will still receive a link to the webinar via Zoom if your plans change. 

Topic:
The Brave New World of meV EELS in the Electron Microscope

Date:
Friday, December 17, 2021, 11:30 a.m. - 12:30 p.m.

Presented By:
Peter Rez, Arizona State University

Location:
Virtual – Zoom  |  In-Person – CEMAS Digital Theater

Session Description:
The combination of energy loss (EELS) and energy-dispersive X-ray spectroscopy (EDX) made it possible to not only image specimens at nanometer (or even atomic) resolution but also map the constituents and give information about bonding. However in optical spectroscopy terms low loss EELS is only equivalent to UV spectroscopy. The combination of the monochromator with the spectrometer on the Nion has opened up not only the visible region, but also makes it possible to probe far infra-red excitations at the nanometer scale. There are four broad areas of application:

1. Nanophotonics
2. Spectroscopic identification of point defects
3. Localized infra-red spectroscopy of biomolecules, including damage free spectroscopy
4. Measuring phonon modes in solids, including localized modes associated with defects

In this talk, Dr. Peter Rez will present examples from each area and discuss what new theoretical/computational methods are needed to quantify these results.