Electron
  Microscopy Group
Facilities: Titan
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FEI Titan3 80-300

The FEI Titan3 (“Titan cubed”) is a 80-300kV FEG-(S)TEM in which the probe forming lens is aberration corrected to allow sub-angstrom STEM imaging. It is equipped with FEIs ultra-bright XFEG source and Wien-type monochromator that allows narrow energy electron probes for high resolution electron energy loss spectroscopy (EELS) for both chemical and electronic characterization. The spectrometer is a Gatan Tridiem 865 high resolution imaging filter. This microscope is operable at three energies: 300, 200 and 80 keV and has a Super-TWIN pole-piece allowing specimen tilting up to +/- 80 degrees with dedicated tomography holders. It is equipped with three annular dark-field (ADF) and one BF detector for STEM imaging modes. An EDAX Si(Li) energy dispersive x-ray detector allows for x-ray microanalysis.

Conventional TEM imaging modes are accommodated with two 2k CCD cameras: one in the Gatan Tridiem spectrometer/imaging filter for energy-filtered TEM (EFTEM); the Gatan UltraScan 1000 retractable CCD camera sits just above the GIF entrance aperture. A rotatable Mollenstedt-Ducker biprism allows for off-axis holography and a Lorentz lens allows field-free imaging of magnetic specimens.

Facilities available on this instrument include:

CEOS CESCOR aberration corrector in the probe forming lens (<0.1nm @ 300 and 200 keV; <0.14nm @ 80 keV).
High brightness FEI XFEG electron source.
FEI Wien-type monochromator (<0.25 eV @ 300 keV, <0.12 eV at 80 keV).
Gatan 865 Tridiem spectrometer/imaging filter with a 2k CCD camera for either spectroscopy or filtered imaging (EFTEM).
Gatan Ultrascan 1000 pre-GIF camera allows unfiltered 2k CCD imaging.
STEM detectors include a Fischione ADF detector, FEI twin ADF/BF pre- spectrometer detectors for simultaneous EELS and ADF imaging. EDAX energy dispersive X-ray spectrometer for X-ray microanalysis.
Rotatable Mollenstedt-Ducker biprism at the selected area aperture plane.
Lorentz lens with <1 nm information limit and <2.5 nm point resolution.

Microscope status: the Titan is now operational.

Microscope access: this microscope is open to all members of the University of Cambridge. Prospective users are encouraged to contact Dr Jon Barnard (jsb43 at cam.ac.uk) to discuss how the Titan might be used to support their research.