Applicants are invited to get in touch with the local contact prior to send a proposal in order to verify the feasibility of their experiment.

NION USTEM 200

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NION USTEM 200 is a C5-corrected STEM fitted with a variable 40-200 keV Cold Field Emission Gun (CFEG) allowing probe sizes from 160 pm (40 keV) to 60 pm (200 keV). The cold FEG allows very good spectral resolution (<0.3 eV) whilst maintaining high brightness. It is fitted with a unique spectrometer with very high sensitivity fast CCD camera. A special coupling module at the entrance of the spectrometer allows very high (up to 50 mrad) angles to enter the spectrometer without compromising the spectral resolution. There are only 5 machines worldwide with the same column design, and only one with a 200 keV gun. The combination CFEG/C5 correction/spectrometer coupling module/fast and high sensitivity EELS is unique worldwide and is perfectly suited to a very large range of problems where chemistry and electronic properties need to be probed at the single atom scale. The very high vacuum combined with a high resolution at low acceleration voltage in the column also makes it ideal for studying electron sensitive materials.

 

 
VGSTEM

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VGSTEM is a CFEG STEM machine working from 40 keV to 100 keV. Typical spatial resolutions are 0.7 nm and spectral resolution 0.35 eV (0.15 eV after numerical processing). It has been constantly refurbished and improved in house. It is fitted with a cold stage (150 K), a very high sensitivity fast CCD camera system for EELS, and a unique home made high throughput, high spectral resolution cathodoluminescence (CL) set-up.


The scanning unit offers unique spectral imaging ability (chrono-spectral imaging) both for EELS and cathodoluminescence. It is particularly suited to EELS studies of fragile materials, and for nano-optics, nanoplasmonics and nanophotonics (both in EELS and cathodoluminescence) experiments.

 

Experimental protocols for NanoCathodoluminescence experiments