Fast, high-resolution electron energy loss spectroscopy and energy filtering
The GIF QuantumER Model 965 imaging filter newly released by Gatan combines the best features of an
energy filter with those of a dedicated electron energy-loss spectrometer. It is ideally suited to serve as
a primary detector system for most analytical transmission electron microscope (TEM) and scanning
transmission electron microscope (STEM) systems. As a spectrometer, the high spectral resolution of
the QuantumER is well matched to both cold-field emission gun and most monochromated microscopes
while the microscecond shutter and high-speed detector take full advantage of the high beam current
of a Schottky emitter.
The 2.5-mm and 5-mm standard spectroscopy apertures of the Quantaum ER imaging filter fully support the high collection angles required for atomic column resolution electron energy-loss spectroscopy (EELS) analysis and the 1000 spectra per second, high-speed EELS acquisition mode means that you can make the most of every electron that hits the sample. A 500x500 EELS spectrum image can be acquired in less than 5 minutes. The integrated STEM detector of the GIF QuantumER ensures that ADF and EELS collection angles are correctly matched.
The QuantumER also excels as an imaging filter. The 9-mm entrance aperture provides an excellent field-of-view while the 5th-order correction keeps the total energy variation below 2 eV over that view. The overall effect is a profound simplicity of operation on any TEM system. By applying the 3rd-order correction the total image distortion added by the image filter can be reduced to negligible levels yielding
unsurpassed filtering imaging performance.
