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|---|---|---|---|---|
| Contact Us | Search | Indexes | Finish Order | |
back to Calibration Overview Page
Magnification and Resolution Test Specimens
Polystyrene Latex Spheres, Catalase Crystals, Ferritin, Gold on "Holey" Carbon Film, Evaporated Platinum / IridiumAstigmatism Correction, X-Ray Detector Test Specimens
"Holey" (perforated) Carbon Film, TEM CHECKERResolution Checks
Lattice Plane Resolution Checks, Gold Shadowed Latex,
TEM Calibration Test Kits, set A and set B
Astigmatism, Resolution, Magnification, Ultrastructure Size
High Resolution Multi-specimen
Ferritin and Gold on "Holey" Carbon Film for Resolution Test and "Holey" Perforated Carbon Film for Astigmatism Correction
MAG*I*CAL
Calibration Standard that performs 3 major instrument calibrations
Combined Test Specimen
Diffraction Standards
Image Rotation
Diffraction Grating Replicas
Gold Shadowed Latex
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Combined TEM Test SpecimenA holey carbon film is shadowed with gold and graphitized carbon particles are deposited. These particles viewed over the holes may be used for assessment of factors limiting the microscope performance. The evaporated gold forms small polycrystalline islands and within these islands lattice fringes can be resolved.This specimen is also used for contamination measurement rates in the electron microscope by noting the deposition rate of carbon within the holes found in the gold film. |
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Diffraction Standard
The nominal value of the effective camera length of an EM operating in the selected
area mode is not sufficiently accurate for calculations of lattice spacing. The actual value of camera
length must be calibrated at the same accelerating voltage and objective lens setting by reference to a
known substance with well defined diffraction spacings. A normal specimen is evaporated film of aluminum.
Very small crystallite size yields ring patterns suitable for calibration. The specimen is supplied with a
list of the principal lattice spacings.
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Image RotationMolybdenum Trioxide |
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When changing from a selected area image of a specimen to a diffraction pattern, the strength of
the intermediate lens is changed, producing an image rotation between the image and the diffraction
pattern. This rotation is seen by photographing a crystal whose shape gives a clear indication of
orientation. A molybdenum trioxide crystal is suitable for this purpose.
PELCO® Technical Notes, Image Rotation Molybdenum Trioxide Crystals, Product No. 625 (pdf)
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Magnification Calibration
Shadowcast carbon replicas of diffraction line gratings, parallel line, waffle pattern gratings and waffle
pattern gratings with latex spheres are offered. Typically, parallel is used up to ~40-50,000x, while the
waffle is used up to ~80-100,000x. Parallel line gratings are 2,160 lines/mm (54,864 lines/inch). The
waffle is 2,160 lines/mm in both directions. Line or "d" spacing for parallel line grating is 462.9nm.
Instructions included. |
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Diffraction Grating Replica with Latex Spheresmagnification calibration specimen |
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Two-in-one; this standard for calibration provides a double-check of the accuracy of
magnification calibration. It is particularly useful at higher magnification. The latex sphere size is
0.261 µm and the grating replica is 2160 lines/mm. Supplied on 3mm grid.
PELCO® Technical Notes, Magnification Calibration Latex Spheres on Diffraction Grating Replica (pdf)
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Gold Shadowed LatexThese are latex particles of 0.204µm diameter shadowed with a fairly heavy coating of gold. The gold forms islands of strongly scattering material and produces a suitable test object for STEM.PELCO® Technical Notes, Gold Shadowed Latex Point Separation Resolution Test, Product No. 628-B (pdf) |
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