Catalog
Number

     Description

Price

Camera Length

40760

Aluminum Diffraction Standard - The nominal value of the effective camera length of an electron microscope operating in the selected area mode is not sufficiently accurate for any 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 evaporated films of aluminum or thallous chloride. The very small crystallite size yields ring patterns suitable for calibration purposes.  A chart with the principal lattice spacings is provided. Standard grid is 3.05mm 200 mesh copper.

$20.50

40825

Thallous Chloride Diffraction Standard - See description above. Standard grid is 3.05mm 200 mesh copper.

$20.95

Image Rotation

40830

Molybdenum Oxide Diffraction Standard - 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. The amount of this rotation can be measured by photographing a crystal whose shape gives a clear indication of orientation. A molybdenum oxide crystal is very suitable for this purpose. Standard grid is 3.05mm 200 mesh copper.

$23.95