The FEI TitanX 60-300 microscope at NCEM is used for hardware, software, and technique development; it is available for user experiments during the remainder of the time. The TitanX is equipped to do fast energy dispersive X-ray mapping (EDS), high-angle STEM or TEM tomography, and in-situ heating/biasing experiments, as well as STEM/TEM. The ability to switch between 60, 80, 120, 200, and 300kV during one TEM session gives the user flexibility to optimize experimental conditions – balancing sample damage, spatial resolution, and signal-to-noise.
Images are acquired with a Gatan UltraScan 1000 (2k x 2k) Camera for high-resolution TEM, a Gatan Orius 830 (2k x 2k) for diffraction and movies (30 frames per second), or a HAADF detector for STEM. The Bruker windowless EDS detector with a solid angle of 0.7 steradians enables high count rates with minimal dead time. The ~5 mm pole gap of the FEI Super-twin objective lens is compatible with a variety of holders including a FEI EDS double-tilt holder, a Hummingbird tomography holder (alpha > +/- 70 degrees), Gatan 652 heating holder, and Protochips single and double tilt heating and biasing holders. Novel experimental techniques such as EDS with tomography, fluctuation microscopy, off-axis holography, and ALCHEMI (Atom Location by Channeling Enhanced Microanalysis) are being implemented on the TitanX.
|Accelerating Voltage||60, 80, 120, 200, and 300 kV|
|Spherical Aberration Cs||1.2 mm|
|Chromatic Aberration Cc:||1.2 mm|
|EDS||Four windowless silicon drift detectors with a total solid angle of 0.7 steradians and 140 eV energy resolution.|
|HRTEM||Gatan UltraScan 1000 2k x 2k CCD|
|Diffraction/Movies||Gatan Orius 830 2k x 2k CCD; 30 fps|
|FEI low background double tilt for EDS||–||±40°/±40°|
|Hummingbird Tomography holder for tomography and EDS||–||±70°/±70°|
|Protochips double tilt holder for in-situ heating and biasing and EDS||23°C-1000°C||±40°/±40°|
|Protochips single tilt holder for in-situ heating and biasing||23°C-1000°C||±30°/±30°|
|FEI low background double tilt for general use||–||±30°/±30°|
|FEI single tilt for general use||–||± 30°|
|Gatan 652-Ta double tilt heating holder||23°C-1000°C||±30°/±30°|
|Gatan 636-DH low background liquid nitrogen cooling holder||-170°C/ 23°C||±30/±30°|