Standard

Standards in GED

Standards are used in GED for calibration of electron wavelength or nozzle position. There are two kinds of them:

Type of standard	Examples
Gas	C6H6, CCl4, CO2, CS2
Polycrystalline	ZnO, TlCl

Polycrystalline standards

Wave reflection on crystal lattice.

Scheme of diffraction experiment on a polycrystalline target.

In this category zinc oxide ZnO is the most common.