Zeiss / LEO EM922 Omega

Type: EM922Omega
Persons in charge: Markus Drechsler,

Manufacturer: LEO (now: Carl Zeiss Microscopy GmbH)

200kV EFTEM with LaB6 Cathode and In-Column Omega Energyfilter

Resolution [nm]: 0,2 (line), 0,29 (point) at 200 kV (HT Objective Lens)
High Voltage [kV] : 120; 160; 200 (variable)
Voltage Range for EELS [eV]: 0 – 2500 (step size 0,2 eV)
Cathode: Thermal LaB6 Cathode
Koehler Illumination System: 4 lenses
Focal Lenght of Objective Lens [mm]: 3
cs [mm]: 2,2
cc [mm]: 2,2
Astigmatism [µm]: <1
Smallest Focus Step [nm]: 15
Spectrometer: Omega Type
Isochromaticity: Energy Resolution (full intensity) ± 6 eV
Isochromaticity: Energy Resolution (reduced intensity) ± 0,65 eV
Spectral Energy Dispersion: 0,8 µm/eV (spectrum plane), 0,3 µm/eV (image plane)
Image Detection: - Photographic Plates (3,25 ” x 4”)
- Gatan CCD Camera (Ultrascan 1000) with GMS 1.9

Webmaster: Dr. Markus Drechsler