'Structure factor' diaporamas de présentation

Structure Determination and Analysis : X-ray Crystallography

Structure Determination and Analysis : X-ray Crystallography. Source. Sample. Detector. Diffraction. Intensity of diffracted beam. X-rays. Energy = hc ?. X-rays. Unlike using a light microscope, there is no way of re-focusing diffracted x-rays.

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Fourier Transform

Fourier Transform. and its applications . Fourier Transforms are used in. X-ray diffraction Electron microscopy (and diffraction) NMR spectroscopy IR spectroscopy Fluorescence spectroscopy Image processing etc. etc. etc. etc. Fourier Transforms. Different representation of a function

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Exploitation of MODIS and MISR Surface Albedos in Support of SVAT Models

Exploitation of MODIS and MISR Surface Albedos in Support of SVAT Models. Bernard Pinty , T. Lavergne, T. Kaminski, O. Aussedat, N. Gobron and M. Taberner with contributions from R. Giering, M. M. Verstraete, M. Vossbeck and J-L. Widlowski

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Frustration and fluctuations in diamond antiferromagnetic spinels

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Magnetic Neutron Diffraction the basic formulas

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Crystal Diffraction

Crystal Diffraction . Laue 1912. 1914 Nobel prize. Max von Laue (1879-1960). Lattice spacing typically. Today X-ray diffraction supplemented by. electron and neutron diffration. Energies X-ray , electrons and neutrons wave-particle. X-ray:. Electrons:. Neutrons:.

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Wave Diffraction and Reciprocal Lattice

Wave Diffraction and Reciprocal Lattice. Most methods for determining the atomic structure of crystals are based of the idea of scattering of radiation. The wavelength of the radiation should be comparable with the distance between atoms ( ).

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Dynamic Correlation Functions of 1D Quantum Liquids

PRL 96 , 196405 (2006);. PRL 99 , 110405 (2007); PRB (2007), PRA (2008). Dynamic Correlation Functions of 1D Quantum Liquids. Alex Kamenev. in collaboration with. Leonid Glazman, Yale Maxim Khodas, BNL. Michael Pustilnik, Georgia Tech. Moscow, SC4 , May 2009. Models.

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Electron Density in Crystals

Electron Density in Crystals. Since the crystal is made up of repeating unit cells, the electron density in the cell must be periodic! This is called the Charge Density Wave. In 1-dimension, the length of the charge density wave is the cell length. One-Dimensional Crystal. Charge Density Wave.

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Intensities

Intensities. Learning Outcomes By the end of this section you should: understand the factors that contribute to diffraction know and be able to use the Structure Factor Equation be able to relate the structure factor equation to systematic absences be aware of the phase problem.

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Static Light Scattering

Static Light Scattering. Outline of Static Light Scattering. Measurement system Rayleigh scattering Static structure factor Form factors Practical problems. Light Scattering Measurement System. Scattering Wavevector. top view. wavevector. scattering wavevector.

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Introduction CCP4i, Files and Utilities Martyn Winn CCP4, CCLRC Daresbury Laboratory

Introduction CCP4i, Files and Utilities Martyn Winn CCP4, CCLRC Daresbury Laboratory m.d.winn@dl.ac.uk. Collaborative Computational Project Number 4. CCP4 software suite : Scope: covers data processing through to refinement and validation

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Generalized Indirect Fourier Transformation (GIFT)

Generalized Indirect Fourier Transformation (GIFT).

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Using the Protein Data Bank: An RCSB-PDB tutorial and more

Using the Protein Data Bank: An RCSB-PDB tutorial and more. Shuchismita Dutta September 2006. The Protein Data Bank. Archive 3-D structural coordinates Experimental data Free wwPDB RCSB, PDBj, EBI-MSD, BMRB. Data files 3-D Coordinates Experimental data. Website

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The Surface Structure of Liquid Metals and Alloys

The Surface Structure of Liquid Metals and Alloys. * Current associates are underlined. Non-Harvard Collaborators: Ben Ocko , Elaine DiMasi, Olaf Magnussen Physics Dept. Brookhaven National Laboratory Moshe Deutsch : Bar Ilan University, Israel

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Mesoscale modelling with the Lattice Boltzmann model

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(a)

Active Crystals of Self Propelled Spheres. Seth Raden , Brandeis University, DMR 0820492. (b). (a).

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electron density

i. structure factor. r. F hkl. f. electron density. Crystallography. | F hkl | (amplitude). ? hkl (phase). i ?. Centrosymmetric structures ? = 0 or ? Non-centrosymmetric structures ? = 0 - 2?.

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