The nominal value of the ffective camera
length of an EM perating in the selected area
mode is not sufficiently accurate for any
calculations of lattice spacing. The actual value
of camera length must be calibrated as the
same accelerating voltage and objective lens
setting by reference to a known substance
with well defined diffraction spacings. The normal specimens are evaporated films on a 3.05mm grid of aluminum or thallous chloride. The very small crystalline size yields ring patterns suitable for calibration purposes.
|80044||Evaporated Aluminum on 3mm grid||each||$28.00||Add to Cart|
|80045||Evaporated Thallous Chloride on 3mm grid||each||21.00||Add to Cart|
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. Evaporated on a 3.05mm grid
|80046||Molybdenum Oxide||each||21.00||Add to Cart|
A slide-guide-calculator used to determine the real-life size of a structure from a micrograph- in micrometer, nanometer or angstrom units. It computes the real-life dimension/mm at magnifications from 1,000 to 100,000 by introducing a multiplication factor of x2 or x1/2. The magnification range can be extended.
Waterproof card, printed in English, German and French
|74804||Ultrastructure Size Calculator||each||6.00||Add to Cart|
A slide-ruler used to apply scale marks to photomicrographs. There are four scale lines for producing scale marks of 10 microns, 1 micron, 0.1 micron (100nm) and 10nm. The scale marker is also used in measuring the real life size of an object in a micrograph. It is made from a clear flexible plastic and it is protected by an enclosed pouch. Instructions are included. Printed in English, German, and French.
|74802||Scale Marker .||each||19.50||Add to Cart|