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Scanning Electron Microscopes

scanning electron microscope (SEM) is a type of electron microscope that produces images of a sample by scanning the surface with a focused beam of electrons. The electrons interact with atoms in the sample, producing various signals that contain information about the surface topography and composition of the sample. The electron beam is scanned in a raster scan pattern, and the position of the beam is combined with the intensity of the detected signal to produce an image. In the most common SEM mode, secondary electrons emitted by atoms excited by the electron beam are detected using a secondary electron detector (Everhart–Thornley detector). The number of secondary electrons that can be detected, and thus the signal intensity, depends, among other things, on specimen topography. Some SEMs can achieve resolutions better than 1 nanometer.

Hitachi S-4300
Hitachi S-4300

Filament Type: Cold-cathode field emission
Detectors: SE/BSE
Image Resolution: Secondary Electron = 1.5 nm
Specimen Stage: Motion range = 50 x 100 mm
Tilt angle = + 5° to + 60°
Rotation = 360° (continuous)
Max Specimen Size: 19—102 mm (height x dia)

Ideal for: high resolution imaging, crystal orientation, Z-contrast imaging

FEI Quanta 250
FEI Quanta 250

Filament Type: field emission
Detectors: SE/BSE/EDX/STEM/E-SEM
Image Resolution: Secondary Electron = 1.0 nm
Specimen Stage: X-Y 50 mm
Tilt angle = + 15° to + 75°
Rotation = 360° (continuous)
Max Specimen Size: 19—102 mm (height x dia)
Low vacuum capability for environmental SEM
Peltier cooling stage for low temperatures work / heating stage up to 800°C
Solution injection needle

Ideal for: high resolution imaging, EDX, biological samples, temperature variation

Zeiss EVO MA 10
Zeiss EVO MA 10

Filament Type: Tungsten
Detectors: SE/VPSE (environmental)/BSE/EDX
Image Resolution: Secondary Electron = 1.9 nm
Specimen Stage: 5-axis motorized stage 80 x 100 x 35mm (translation XYZ)
Tilt angle = + 10° to + 90°
Rotation = 360° (continuous)
Specimen Size: 100 mm x 200 mm (Height x Diameter), max weight 500g

Ideal for: elemental analysis and mapping, biological samples, large samples, fracture analysis, Z-contrast imaging