TEM

Equipment Specifications

Electron source:

• Schottky Field Emission Gun (FEG) emitter.
• High voltage range 80-200 kV.
• Probe current 1 nm spot C-TWIN ≥ 0.3 nA.​
  
  

Electron optics:

Talos is equipped with new FEI-designed optics electronics that comes with ultimate stability and enables rotation-free imaging. Talos also offers Full-Range Constant-Power Objective lens control through which ultimate stability while switching modes is guaranteed. At this pre-aligned acceleration voltage, critical microscope characteristics are maximized, helping ultimate performance in imaging and analysis: maximum brightness, current, sample penetration and HR-TEM and HR-STEM resolution. The settings of these alignments are stored and can be recalled by the user.

The microscope column:

Some highlights of the Talos F200C column are:
Oil-free vacuum system
Symmetric C-TWIN objective lens for high contrast
High-speed, digital search-and-view camera (SmartCam)
Pneumatically driven beam stop for diffraction work
Automated apertures
Cold-trap Dewar that provides Talos with a full day supply of liquid nitrogen, alleviating the maintenance routine
Full system enclosure

 Vacuum system:

Talos's vacuum system ensures a clean, high-quality vacuum throughout the column, with special attention being paid to the specimen and emission chamber.  The vacuum system of the Talos is completely oil-free. It comprises a membrane pump with buffer vessel, a turbo-molecular pump on the projection chamber and airlock; and three ion getter pumps on the column/accelerator/gun areas. An automatic vacuum valve in between the gun and the column is present to allow the gun vacuum to remain functional all the time. This allows the emitter and gun accelerating voltage to remain on even during sample exchange.  A cooling device with cold trap and liquid nitrogen Dewar is fitted in the objective block to maintain the cleanliness of the vacuum. A cryo-cycle option is available, which provides an automated routine allowing the column to be pumped by the turbo-molecular pump during warm-up cycle of the cooling device. The result is a very clean column and vacuum system.

Automatic apertures:

All apertures are fully computer controlled and motorized on Talos. Alignments and positions are automatically recalled. The control includes motorized mechanisms, the electronics and the software needed to fully automate the use of the apertures.

Ceta 16M CCD Camera 200kV:

Ceta 16M is FEI's latest 16-megapixel digital camera designed for imaging and diffraction applications. Ceta 16M is retractable and mounted under the microscope in an on-axis position. The optimized phosphorous scintillator is fiber optically coupled to a 4kx4k, 14x14 μm2 pixel Peltier cooled CMOS sensor.

The camera's scientific grade sensor provides large field of view images with high sensitivity even under low dose conditions The CMOS sensor technology allows for fast read-out for dynamic experiments. The camera is fully embedded in the FEI architecture and can easily switch between fast screening and the recording of high quality and high resolution images.

Selected specifications of Ceta 16M:

• Sensor: 4,096 x 4,096 CMOS
• Pixels: 14 x 14 μm²
• Digitization: 16 bit
• Binning: 1x, 2x, 4x, 8x
• Acquisition speeds (fps = frames per second):
• 4k x 4k: 1 fps
• 2k x 2k: 8 fps
• 1k x 1k: 18 fps
• 512 x 512: 25 fps
  
   
  Available specimen holders:
•    CompuStage Single-Tilt Holder
•    CompuStage Double Tilt Holder
•    CompuStage Multi-Specimen Holder (up to     3 grids)
•   Single-Tilt Tomography Holder
•   Gatan 70° FOV Cryo-transfer Holder