Recent Applications of Sub-20 meV Monochromated STEM-EELS : from Phonon to Core Losses in Real and Momentum Spaces

Energy-Filtered High-Angle Dark Field Mapping of Ultra-Light Elements

Using the High Energy Resolution Monochromated EELS-STEM (HERMES) system we recently introduced [1] together with Gatan’s Enfinium spectrometer with upgraded ultra-high stability power supplies [2], energy resolution as low as 14 meV has been demonstrated in electron energy loss spectra (EELS) acquired in 0.1 s (Fig. 1), and sub-20 meV resolution has become typical for routine acquisitions of s...

High-resolution monochromated electron energy-loss spectroscopy of organic photovoltaic materials.

Advances in electron monochromator technology are providing opportunities for high energy resolution (10 - 200meV) electron energy-loss spectroscopy (EELS) to be performed in the scanning transmission electron microscope (STEM). The energy-loss near-edge structure in core-loss spectroscopy is often limited by core-hole lifetimes rather than the energy spread of the incident illumination. Howeve...

Monochromated STEM with a 30 meV-wide, atom-sized electron probe.

The origins and the recent accomplishments of aberration correction in scanning transmission electron microscopy (STEM) are reviewed. It is remembered that the successful correction of imaging aberrations of round lenses owes much to the successful correction of spectrum aberrations achieved in electron energy loss spectrometers 2-3 decades earlier. Two noteworthy examples of the types of STEM ...

Enhancement of resolution in core-loss and low-loss spectroscopy in a monochromated microscope.

The significant enhancement of the energy resolution in the new generation of commercially available monochromated transmission electron microscopes presents new challenges in term of selecting the correct experimental conditions and understanding the various effects that can potentially influence the quality of the EELS data. In this respect we investigated the effect of point spread function ...

Detection of oxygen sub-lattice ordering in A-site deficient perovskites through monochromated core-loss EELS mapping