Single-Crystal Electronic Structure

Strong L, Whitesides GM (1988) Structures of self-assembled monolayer films of organosulfur compounds adsorbed on gold single crystals electron diffraction studies. Langmuir 4 546-558... 

Deficiencies in intensities, which occur in x-ray powder dififiaction as well as in single crystal electron diffiaction, may cause problems even in early stages of ab initio structure analysis. Nevertheless, examples for successful use of the tangent formula or Sayre equation for structure determination from ED data have been worked out [14]. Other direct methods, like maximum entropy can provide us with an envelope of the molecules in the cell, which delivers an idea of its orientation [15]. An alternative approach to ab initio structure determination is the calculation of the gas phase conformation of an initial model for subsequent refinement by energy minimization [16]. 

Honjo, C., N. Kitamura, and K. Mihama (1954). A study of clay minerals by means of single crystal electron diffraction diagrams structure of tubular kaolin. 

The Ba K BiOj phase may not be stable under conditions used for high resolution transmission electron microscopy (12). This could impede studies of domain structures which may be present in the "single" crystals that structural research now revolves around. 

Another conceivable structure, namely a monomeric four-membered ring, was observed when electron-withdrawing C6P5 substituents were introduced at boron to increase its Lewis acidity (compounds 40a-d).52 53 The presence of intramolecular P-B interaction was unambiguously substantiated by 31P and 11B NMR data (Figure 7). So far, the lack of suitable single crystals prevented structural characterization, but DFT calculations... 

The agreement index from the observed single crystal electron diffraction structure factors (28 separate reflections) compared to the calculated structure factors for the Yokouchi at. model was 0.33. This is far from the values of 0.24 and 0.135 reported for the two published x-ray fiber analyses (14,15). ... 

Comparison of Some Observed (Fo) Structure Factors Derived from X-Ray Fiber Diffraction and Single Crystal Electron Diffraction on PHB. 

S-Donor ligands. As an extension of previous studies on related complexes of iron(n), cobalt(n), nickel(n), and zinc(n), the structure of Mn[SPPh2-N PPh2S]2 has been determined by X-ray methods. The metal atom is co-ordinated in an approximately tetrahedral manner by the four sulphur atoms. The two MnS2P2N rings adopt the twisted boat conformation with S and P atoms at the apices. The single-crystal electronic spectrum has been measured and interpreted.92... 

The present work deals with soUd CT complexes of phenazines which, in the most favorable cases, include the crystal structure, single-crystal electron spin resonance (epr) data, the temperature dependence of the magnetic susceptibility or of the powder conductivity, and a CT absorption spectrum. We have not pursued complexes that could not be crystallized, nor have we investigated completely similar materials. 

A chip fabrication process starts with a wafer of high-purity silicon that has been cut from a single crystal. Electronic functionality is achieved by creating a multilayer structure in and on the surface of the wafer in a precise geometric pattern. The pattern is laid down by a process known as photolithography using the following sequence of steps ... 

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