Gatan imaging filter

Gatan imaging filter Green s function high-angle ADF... 

In the development of Gai and Boyes (87,88,90), the ECELL, atomic-resolution (HRTEM), STEM, hot stage and PEELS/Gatan imaging filter (GIF) functionalities were combined in a single instalment. The combination is required to aid simultaneous dynamic structure and composition of the reactor contents. 

Fig. 1. Photo and illustration of the HRTEM allowing acquisition of images of catalysts under working conditions (4). The microscope is equipped with an FEG, a quadrupole mass spectrometer (QMS), a Gatan image filter (GIF), and a Tietz F144 CCD for data acquisition. The differential pumping system consists of IGPs, turbo molecular pump units (TMP, MDP), and an oil diffusion pump (ODP). The differential pumping stages are set up by apertures inside the TEM column (denoted by black bars) at the objective lens (OL), the first (Cl) condenser aperture, the second (C2) condenser aperture, and the selected area aperture (SA).

For TEM investigations, the powder samples of the catalysts were ultrasonically dispersed in ethanol and mounted onto a copper grid covered with holy carbon film. A Philips CM200 FEG electron microscope, operating at 200 kV and equipped with a Gatan imaging filter, GIF 100, was used for TEM observation. EDX analysis was performed in the same microscope using a DX4 analyzer system (EDAX). 

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