Dirkjan: Created page with "Stands for Gatan Imaging Filter: Is installed below a TEM, allows to record electron energy loss spectra (EELS) and element specific images (elemental maps) by means..."

2020-08-25T08:18:54Z

Created page with "Stands for Gatan Imaging Filter: Is installed below a TEM, allows to record electron energy loss spectra (EELS) and element specific images (elemental maps) by means..."

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Stands
for Gatan Imaging Filter:

Is installed below a TEM, allows to record
electron energy loss spectra ([[EELS|EELS]]) and element specific images
(elemental maps) by means of the electron spectroscopic imaging (ESI)
technique. Mostly, the so-called [[three-window method|three-window method]] is applied for
mappings (see figure): an image is taken after a suitable ionisation
edge of the corresponding element (post-edge image, ΔE3), two
additional images (pre-edge 1, ΔE1, and pre-edge 2, ΔE2) are recorded
at energy losses smaller than the ionisation edge. Only the electrons
passing through the selected energy slit contribute to these images.
Specimen drift during recording of these images is compensated for by a
cross-correlation algorithm implemented in the software of the GIF. The
pre-edge images are used for an approximate determination of the
unspecific background which is then subtracted from the post-edge image
leading to an elemental map with enhanced contrast. Alternatively, the
post-edge image can be divided by a pre-edge image (ratio
method).

{| class="wikitable"
|[[GIF 860|GIF 860]]
|1kx1k
|retractable TV rate camera
|-
|[[GIF 850|GIF 850]]
|2kx2k
|retractable TV rate camera
|-
|[[GIF 863 Tridium|GIF 863 Tridium]]
|2kx2k
|[[Ultrascan 1000|Ultrascan 1000]]
|-
|[[GIF 865 Tridium ER|GIF 865 Tridium ER]]
|2kx2k
|[[Ultrascan 1000|Ultrascan 1000]]
|-
|}
On Titan off axis TV camera are not
supported. A presence of the TV camera discriminates between the
850/860 and newer Tridium series.

All GIF's are mounted with a
camera block. This is easier for alignments when you add a so called
pre-GIF or high-res camera. Main precondition is that a high-res camera
needs to be retractable. Only Gatan cameras have this ability: [[US
1000]], [[US 2000|US 2000]], [MSI 794]]
[[Category:microscopy]]

[[Category:EELS]]

[[Category:GIF]]

GIF - Revision history

Dirkjan: Created page with "Stands for Gatan Imaging Filter: Is installed below a TEM, allows to record electron energy loss spectra (EELS) and element specific images (elemental maps) by means..."