$diffraction refraction$

It is shown that refraction will have the effect of broadening diffraction rings, even for irregular particles, and will give rise to line breadth and intensity anomalies in diffraction patterns from specimens with regular crystal habit. Streaks observed on ZnO smoke rings are explained as due to refraction by the long thin spines characteristic of this material. What is the difference between reflection, refraction and diffraction These are all properties of waves and their definitions are useful to remember for exams. The outer component represents an unexplained value of about 25 volts. In both reflection and refraction, light waves must be incident at a boundary between regions containing substances with different refractive indices. For the doubled streaks the elongation of the inner component represents a varation of inner potential about this value, arising from excess metal atoms in the lattice. The value of the inner potential varies with the reflecting plane from 12 to 16 volts. Quantitative agreement for the separation of the arc components is obtained by assuming values of inner potential of the order to be expected.

$diffraction refraction$ $diffraction refraction$

Application of these expressions to particular cases has shown complete agreement between the calculated and observed form of the fine structure of the rings, arcs and groups of streaks. On the basis of this theory, general expressions have been derived for the deviation of the direction of the diffracted beam owing to refraction at the faces of cubes. The theory that the fine structure of the rings arises from refraction at the faces of the regularly shaped particles (cubes) was suggested by Sturkey and Frevel (1945). Spotty rings given by brown CdO (containing excess metal atoms) and some MgO specimens are composed of short streaks forming groups of up to six radiating from the expected position of a single-crystal reflection, and in some cases these streaks are divided into inner and outer components. More detailed observations of this phenomenon have been made It has been observed that the arcs given by tilting of oriented specimens are divided into several components, which vary in intensity and separation with angle of tilt of the specimen.

$diffraction refraction$

Electron diffraction rings from MgO and CdO smokes have previously been shown under high resolution to be multiple.

$diffraction refraction$

Diffraction refraction