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DIFFRACTION BY SOLIDS
Diffraction performs when a wave interacts with a lattice whose dimensions are of the same order of magnitude as that of the wavelength of the waves. The lattice scatters the radiation, and the scattered radiation from one point interferes with the radiation from others so as to either reduce it (destructive interference), or enhance the amplitude of the radiation (constructive interference). The pattern of destructive and constructive interference yields information about molecular and crystal structure.
Fig.1. Constructive (a) and destructive (b) interference of two
waves.
In the case of solids, this wavelength must be of the same order as the crystal lattice spacing (ca. 0.1nm), and there are three primary types of radiation which are used for structural studies of solids. The most commonly used radiation, X-rays, have wavelengths of the order of 0.15 nm, and in the course of diffraction studies are scattered by the electron density of the molecule.
2 thermometers, A and B, are wrapped in pieces of gauze. The gauze around thermometer A is moistened with water and the gauze around thermometer B is moistened with Ether(a volatil
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Visualisation of hybrid orbitals
Q. Define standard reduction potential ? Ans. The standard reduction potential, E o As we have seen in the example of a chemical cell in the previous section, the redox rea
Ask question #Minimureaction with Nam 100 words accepted#
IUPAC System of Naming Organic Compounds In the IUPAC (International Union of Pure and Applied Chemistry) system, the name of an organic compound contain three parts that are:
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