Optimization of Monochromated TEM for Ultimate Resolution Imaging and Ultrahigh Resolution Electron Energy Loss Spectroscopy

Abstract
The performance of a monochromated transmission electron microscope with Wien type monochromator is optimized to achieve an extremely narrow energy spread of electron beam and an ultrahigh energy resolution with spectroscopy. The energy spread in the beam is improved by almost an order of magnitude as compared to specified values. The optimization involves both the monochromator and the electron energy loss detection system. We demonstrate boosted capability of optimized systems with respect to ultra-low loss EELS and sub-angstrom resolution imaging (in a combination with spherical aberration correction).

Citation
Lopatin S, Cheng B, Liu W-T, Tsai M-L, He J-H, et al. (2018) Optimization of monochromated TEM for ultimate resolution imaging and ultrahigh resolution electron energy loss spectroscopy. Ultramicroscopy 184: 109–115. Available: http://dx.doi.org/10.1016/j.ultramic.2017.08.016.

Acknowledgements
Authors would like to thank Dr. Peter C Tiemeijer from FEI Co for fruitful comments and discussions regarding the monochromator operation and optimization. Also we would like to acknowledge Dmitry Melnikau for providing a sample of Ag nanowires.

Publisher
Elsevier BV

Journal
Ultramicroscopy

DOI
10.1016/j.ultramic.2017.08.016

PubMed ID
28886488

Additional Links
http://www.sciencedirect.com/science/article/pii/S0304399117302073

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