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Transmission Electron Microscope

Latest addition : 2 December 2008.

Microscope FEI: TECNAI G² 20 Twin

  • Accelerating voltage : 200 kV
  • Gun : LaB6
  • Spatial resolution : 0.27 nm
  • line resolution : 0.13 nm
  • Spherical aberration coefficient : 2.0 mm
  • Specimen chamber vacuum: 1.10-7 Torr
  • Goniometer tilts : α tilt ± 70 deg ; β tilt depends of the holder
  • Minimum spot size at 200 kV: 10 nm
  • Magnification ranges : 70 to 700000
  • Diaphragms:
    • Condenser: 30, 50, 100, 200 µm
    • Objective: 10, 20, 40, 100 µm
    • Selected Area : 10, 40, 200, 800 µm






Specimen holders (3 mm diameter)

Room temperature holders

Holder type Tilt β
Single tilt FEI
Double tilt FEI ± 30° EDX analysis
Double tilt GATAN ± 30° EDX analysis + Faraday cup
Tilt Rotation PHILIPS ± 360°

Heating holders

Holder type Tilt β Temperature
Double tilt heating GATAN ± 30° 800°C Inconel
Single tilt heating GATAN - 1300°C Tantalum
Special irradiation double tilt heating GATAN ± 30° 800°C Inconel

Cooling holder

Holder type Tilt βTemperature
Double tilt cooling GATAN ± 15° LN2 EDX analysis + Faraday cup

Recording capabilities

  • Upper mount camera for pictures or video of wide areas : GATAN ES500W 1k x 1k ( Link )
  • High resolution camera ORIUS 200 GATAN (digital video recording 2k x 2k ( Link )
  • Films : 8 x 10 cm ; 56 sheets

Analysis

  • EDX analysis (Brucker)
  • Energy Filter GIF TRIDIEM GATAN [resolution 0.6eV camera Ultrascan 2k x 2k + ( Link )]
  • STEM Bright field and Dark field detector ( Link )
  • HAADF GATAN (on axis) ( Link )

Geometry

The transmission electron microscope (TEM) is placed below the level of accelerators on an anti-vibration base. Lines from ARAMIS and IRMA are bent downwards and enter into the TEM column at 22°/horizontal with a 45° angle between them in the horizontal plane. Vibrations from the accelerators are suppressed by damping line sections. The choice of the microscope was mainly dictated by the possibility to have large ion beam apertures and a large enough space to locate open Faraday cups for the continuous measurement of beam current close to the sample, in order to ensure accuracy and reproducibility of the dose rate within at most 10%. Ultra-thin heating and cooling sample-holders – from liquid nitrogen to 800°C – have been designed to minimise shadowing effects: an area of at least 1 mm diameter, irradiated by both ion beams, is thus accessible to observation under any sample tilt angle (α and β).


An explanatory schema
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Surface of irradiation of the samples by the two ion beams.



Attached documents