Thermo Fisher Spectra 300 (Kraken) Details

Duffield Hall 150 (Primary Staff: John Grazul; Secondary Staff: Phil Carubia, Mick Thomas)

The Spectra 300 (Kraken) is a Scanning Transmission Electron Microscope (STEM) for ultra-high-resolution imaging and composition analysis.

• An ultra-high brightness cold field emission (X-CFEG) gun is used for maximum image resolution and high beam current for analysis.
• A spherical aberration corrector is integrated into its column, which nulls all axial aberrations of the condenser system up to fifth order.
• An Electron Microscope Pixel Array Detector (EMPAD) is a direct electron detector with high-dynamic range and 1100 fps maximum acquisition rate, enabling unique and powerful imaging and analytical capabilities. Its high current limit per pixel and single electron sensitivity enables the recording of fast, high-quality diffraction patterns for 4-D STEM analysis of local strain, order, orientation, and magnetic and electric fields. Ptychography reconstruction of the 4-D data provides resolution beyond the diffraction limits (≤ 20 pm lateral resolution) and three-dimensional information (≤ 4 nm depth resolution).
• Operating voltages of 60, 120, 200, and 300 kV are available, providing resolutions to 0.05 nm (at 300keV) and flexibility for imaging sensitive materials.
• EELS (Gatan Continuum GIF) and X-ray (Bruker Dual-X) detectors enable elemental analysis and information on local bonding states.
• TFS Ceta 16M 4k x 4k CMOS detector for routine TEM and diffraction imaging. Panther STEM detector for BF/DF/DPC STEM.
• Single and double tilt holders for room temperature and cryo work. Retractable cryo-shield for improved stability and reduced contamination with cryo holders.
• Available modes of operation: Kraken is primarily dedicated to high-resolution HAADF-STEM, EELS, and 4D-STEM; TEM, cryo-TEM, cryo-Tomography, Bright Field/Dark Field/DPC TEM/STEM, EELS/EDX analysis, TEM/STEM, energy filtered TEM, and Low Dose imaging are available.