Zusammenfassung für die Prüfungsvorbereitung. Cut-out patterns to make your own models of the Brillouin zones. Beugung am Kristallgitter - Günter Krois und Markus Kurz, 2008. The shape and the dimensions of the unit cell can be deduced from the position of the Bragg reflections the content of the unit cell, on the other hand, must be determined from the intensities of the reflections. You should be able to define: powder diffraction, neutron diffraction, LEED, and Ewald shphere.Įquivalent statements of the diffraction condition. (The basis is the pattern of atoms that are repeated at every Bravais lattice site to create the crystal.) You should know how the square of the structure factor can be measured in a diffraction experiment and how this information can be used to determine the basis of the crystal structure. 
These are the complex coefficients of the Fourier series.
CRYSTALDIFFRACT MANUAL HOW TO
You should know how to calculate structure factors. You should be able to explain how the Bravais lattice and the size of the unit cell can be determined in a diffraction experiment. You should know the different forms of the diffraction condition given in the table below. You should be able to construct the first Brillouin zone of any reciprocal lattice. The reciprocal lattice of fcc is bcc and the reciprocal lattice of bcc is fcc. You should know that the reciprocal lattice of an orthorhombic lattice ( a,b,c) is also an orhtorhombic lattice (2π/ a,2π/ b,2π/ c). You should be able to determine the reciprocal lattice vectors of any Bravais lattice. r), where the G's are the reciprocal lattice vectors. You should know that every periodic function can be expressed as a Fourier series, f( r) = Σ f Gexp( i G. Kittel chapter 2: Crystal diffraction or R. 
Light, sound, neutrons, atoms, and electrons are all diffracted by crystals. When waves move through a crystal they diffract. Everything moves like a wave and exchanges energy and momentum like a particle.
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