Atom Probes

Information about available instruments at the APT laboratory.

Wide-Angle Tomographic Atom Probe (WATAP)

  • Base voltage: < 15 kV
  • Laser mode (see below) and electrical pulse mode:
    • Pulse voltage < 3.5 kV
    • Pulse frequency: < 200 kHz
    • Pulse width: 5 ns
  • Flight path: 30 cm
  • Diameter of the MCPs: 12 cm
  • Opening angle: ~25°
  • Temperatur: > 40 K
  • Additional reaction cell:
    • H, CO, O2 ...
    • Temperature: < 450 °C
  • Additional field ion microscope

Micro-Electrode Tomographic Atom Probe (METAP)

  • Base voltage: <15 kV
  • Evaporation by laser pulses
  • Diameter of optional microelectrodes: 10 - 50 μm
  • Temperature: > 30 K
  • Flight path: 12 cm
  • Diameter of the MCPs: 12 cm
  • Opening angle: 30°

Modular Tomographic Atom Probe (M-TAP)

  • Atom probe of minimum size with only one vacuum chamber + airlock for a direct connection the  FIB-SEM Scios
  • Base voltage: < 15 kV
  • Evaporation by laser pulses
  • Detector:
    • Efficiency > 80%
    • Triple Stack, Delay Line
    • Diameter of the MCPs: > 75 mm
  • Flight length: 10,5 cm
  • Measurement rate: 107 Atome/h
  • Temperature: > 20 K
  • Opening angle: 40°
  • Transfer shuttle with high precision 6-axes piezo stage  (X, Y, Z, rotation X, rotation Y, rotation Z)

Field-Ion Microscope

  • Imaging gases: He, Ne
  • Tip temperature: T>25 K
  • Flight path: 5 cm
  • Screen diameter: 75 mm
  • Sample tilting range +/- 60° (two axes)

Laser pulsing systems

Mode-locked fiber-laser „Impulse“ by ClarkMXR

  • Pulse frequency: 100 - 500 kHz
  • Puls width: 10 ps - 250 fs
  • Laser wavelengths (F/SHG/THG): 1030nm / 515nm / 343nm
  • Spot size: > 15 μm

Coherent Laser

This image shows Patrick Stender

Patrick Stender

Dr.

Sr. Scientist

This image shows Guido Schmitz

Guido Schmitz

Prof. Dr. Dr. h.c.

Chair Professor

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